20525988 has 24 divisors (see below), whose sum is σ = 54736192. Its totient is φ = 5864544.

The previous prime is 20525971. The next prime is 20526031. The reversal of 20525988 is 88952502.

It is a super-2 number, since 2×20525988² = 842632366752288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 122095 + ... + 122262.

Almost surely, 2^20525988 is an apocalyptic number.

20525988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20525988 is an abundant number, since it is smaller than the sum of its proper divisors (34210204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20525988 is a wasteful number, since it uses less digits than its factorization.

20525988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244371 (or 244369 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 20525988 is about 4530.5615545978. The cubic root of 20525988 is about 273.8007858071.

The spelling of 20525988 in words is "twenty million, five hundred twenty-five thousand, nine hundred eighty-eight".