20518925 has 12 divisors (see below), whose sum is σ = 29078496. Its totient is φ = 14070000.

The previous prime is 20518909. The next prime is 20518943. The reversal of 20518925 is 52981502.

It is not a de Polignac number, because 20518925 - 2⁴ = 20518909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20518891 and 20518900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58451 + ... + 58800.

It is an arithmetic number, because the mean of its divisors is an integer number (2423208).

Almost surely, 2^20518925 is an apocalyptic number.

20518925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20518925 is a deficient number, since it is larger than the sum of its proper divisors (8559571).

20518925 is a wasteful number, since it uses less digits than its factorization.

20518925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117268 (or 117263 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20518925 is about 4529.7820035847. The cubic root of 20518925 is about 273.7693772207.

The spelling of 20518925 in words is "twenty million, five hundred eighteen thousand, nine hundred twenty-five".