20903265 has 20 divisors (see below), whose sum is σ = 37471764. Its totient is φ = 11148192.

The previous prime is 20903227. The next prime is 20903273. The reversal of 20903265 is 56230902.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 13417569 = 2736^2 + 3663^2 .

It is not a de Polignac number, because 20903265 - 2⁸ = 20903009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25402 + ... + 26211.

Almost surely, 2^20903265 is an apocalyptic number.

It is an amenable number.

20903265 is a deficient number, since it is larger than the sum of its proper divisors (16568499).

20903265 is an equidigital number, since it uses as much as digits as its factorization.

20903265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51630 (or 51621 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20903265 is about 4572.0088582591. The cubic root of 20903265 is about 275.4681392619.

The spelling of 20903265 in words is "twenty million, nine hundred three thousand, two hundred sixty-five".