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20333220 = 22351132999
BaseRepresentation
bin100110110010…
…0001010100100
31102021000221020
41031210022210
520201130340
62003451140
7334554345
oct115441244
942230836
1020333220
1110528716
126986ab0
13429bcbb
1429b40cc
151bb99d0
hex13642a4

20333220 has 48 divisors (see below), whose sum is σ = 57456000. Its totient is φ = 5372416.

The previous prime is 20333213. The next prime is 20333231. The reversal of 20333220 is 2233302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20333220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5281 + ... + 8279.

It is an arithmetic number, because the mean of its divisors is an integer number (1197000).

It is a self-describing number.

Almost surely, 220333220 is an apocalyptic number.

20333220 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 20333220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28728000).

20333220 is an abundant number, since it is smaller than the sum of its proper divisors (37122780).

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

20333220 is a wasteful number, since it uses less digits than its factorization.

20333220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 3122 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 15.

The square root of 20333220 is about 4509.2371860438. The cubic root of 20333220 is about 272.9409632300.

Adding to 20333220 its reverse (2233302), we get a palindrome (22566522).

It can be divided in two parts, 2033 and 3220, that added together give a triangular number (5253 = T102).

The spelling of 20333220 in words is "twenty million, three hundred thirty-three thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 113 226 339 452 565 678 1130 1356 1695 2260 2999 3390 5998 6780 8997 11996 14995 17994 29990 35988 44985 59980 89970 179940 338887 677774 1016661 1355548 1694435 2033322 3388870 4066644 5083305 6777740 10166610 20333220