20215925 has 6 divisors (see below), whose sum is σ = 25067778. Its totient is φ = 16172720.

The previous prime is 20215883. The next prime is 20215967. The reversal of 20215925 is 52951202.

It is an interprime number because it is at equal distance from previous prime (20215883) and next prime (20215967).

It can be written as a sum of positive squares in 3 ways, for example, as 2289169 + 17926756 = 1513^2 + 4234^2 .

It is not a de Polignac number, because 20215925 - 2⁶ = 20215861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20215894 and 20215903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404294 + ... + 404343.

It is an arithmetic number, because the mean of its divisors is an integer number (4177963).

Almost surely, 2^20215925 is an apocalyptic number.

20215925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20215925 is a deficient number, since it is larger than the sum of its proper divisors (4851853).

20215925 is an equidigital number, since it uses as much as digits as its factorization.

20215925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808647 (or 808642 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20215925 is about 4496.2122948099. The cubic root of 20215925 is about 272.4151181913.

The spelling of 20215925 in words is "twenty million, two hundred fifteen thousand, nine hundred twenty-five".