20902625 has 8 divisors (see below), whose sum is σ = 26086632. Its totient is φ = 16722000.

The previous prime is 20902589. The next prime is 20902633. The reversal of 20902625 is 52620902.

It can be written as a sum of positive squares in 4 ways, for example, as 508369 + 20394256 = 713^2 + 4516^2 .

It is not a de Polignac number, because 20902625 - 2¹² = 20898529 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 20902594 and 20902603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83486 + ... + 83735.

It is an arithmetic number, because the mean of its divisors is an integer number (3260829).

Almost surely, 2^20902625 is an apocalyptic number.

20902625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20902625 is a deficient number, since it is larger than the sum of its proper divisors (5184007).

20902625 is an equidigital number, since it uses as much as digits as its factorization.

20902625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167236 (or 167226 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20902625 is about 4571.9388666079. The cubic root of 20902625 is about 275.4653278764.

The spelling of 20902625 in words is "twenty million, nine hundred two thousand, six hundred twenty-five".