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13245720 = 23351743151
BaseRepresentation
bin110010100001…
…110100011000
3220220221201020
4302201310120
511342330340
61151522440
7220405155
oct62416430
926827636
1013245720
117527784
124529420
13298a007
141a8b22c
1512699d0
hexca1d18

13245720 has 128 divisors (see below), whose sum is σ = 43338240. Its totient is φ = 3225600.

The previous prime is 13245709. The next prime is 13245731. The reversal of 13245720 is 2754231.

It is an interprime number because it is at equal distance from previous prime (13245709) and next prime (13245731).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87645 + ... + 87795.

It is an arithmetic number, because the mean of its divisors is an integer number (338580).

Almost surely, 213245720 is an apocalyptic number.

13245720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13245720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21669120).

13245720 is an abundant number, since it is smaller than the sum of its proper divisors (30092520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13245720 is a wasteful number, since it uses less digits than its factorization.

13245720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 13245720 is about 3639.4669939429. The cubic root of 13245720 is about 236.6056930363.

Adding to 13245720 its reverse (2754231), we get a palindrome (15999951).

The spelling of 13245720 in words is "thirteen million, two hundred forty-five thousand, seven hundred twenty".

Divisors: 1 2 3 4 5 6 8 10 12 15 17 20 24 30 34 40 43 51 60 68 85 86 102 120 129 136 151 170 172 204 215 255 258 302 340 344 408 430 453 510 516 604 645 680 731 755 860 906 1020 1032 1208 1290 1462 1510 1720 1812 2040 2193 2265 2567 2580 2924 3020 3624 3655 4386 4530 5134 5160 5848 6040 6493 7310 7701 8772 9060 10268 10965 12835 12986 14620 15402 17544 18120 19479 20536 21930 25670 25972 29240 30804 32465 38505 38958 43860 51340 51944 61608 64930 77010 77916 87720 97395 102680 110381 129860 154020 155832 194790 220762 259720 308040 331143 389580 441524 551905 662286 779160 883048 1103810 1324572 1655715 2207620 2649144 3311430 4415240 6622860 13245720