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25494220 = 22517167449
BaseRepresentation
bin110000101000…
…0001011001100
31202222020111101
41201100023030
523011303340
62310232444
7426461113
oct141201314
952866441
1025494220
1113433204
128655724
13538814b
143558c7a
152388c9a
hex18502cc

25494220 has 48 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 9519104.

The previous prime is 25494211. The next prime is 25494229. The reversal of 25494220 is 2249452.

It is an interprime number because it is at equal distance from previous prime (25494211) and next prime (25494229).

It is not an unprimeable number, because it can be changed into a prime (25494229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56556 + ... + 57004.

It is an arithmetic number, because the mean of its divisors is an integer number (1190700).

Almost surely, 225494220 is an apocalyptic number.

25494220 is a gapful number since it is divisible by the number (20) 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 25494220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28576800).

25494220 is an abundant number, since it is smaller than the sum of its proper divisors (31659380).

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

25494220 is a wasteful number, since it uses less digits than its factorization.

25494220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 25494220 is about 5049.1801314669. The cubic root of 25494220 is about 294.3160252725.

The spelling of 25494220 in words is "twenty-five million, four hundred ninety-four thousand, two hundred twenty".

Divisors: 1 2 4 5 10 17 20 34 68 85 167 170 334 340 449 668 835 898 1670 1796 2245 2839 3340 4490 5678 7633 8980 11356 14195 15266 28390 30532 38165 56780 74983 76330 149966 152660 299932 374915 749830 1274711 1499660 2549422 5098844 6373555 12747110 25494220