20925225 has 18 divisors (see below), whose sum is σ = 37479806. Its totient is φ = 11160000.

The previous prime is 20925209. The next prime is 20925263. The reversal of 20925225 is 52252902.

It can be written as a sum of positive squares in 3 ways, for example, as 3884841 + 17040384 = 1971^2 + 4128^2 .

It is not a de Polignac number, because 20925225 - 2⁴ = 20925209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46276 + ... + 46725.

Almost surely, 2^20925225 is an apocalyptic number.

20925225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20925225 is a deficient number, since it is larger than the sum of its proper divisors (16554581).

20925225 is a wasteful number, since it uses less digits than its factorization.

20925225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93017 (or 93009 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20925225 is about 4574.4097979958. The cubic root of 20925225 is about 275.5645701817.

The spelling of 20925225 in words is "twenty million, nine hundred twenty-five thousand, two hundred twenty-five".