20925855 has 12 divisors (see below), whose sum is σ = 36271560. Its totient is φ = 11160432.

The previous prime is 20925847. The next prime is 20925881. The reversal of 20925855 is 55852902.

It is not a de Polignac number, because 20925855 - 2³ = 20925847 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232465 + ... + 232554.

It is an arithmetic number, because the mean of its divisors is an integer number (3022630).

Almost surely, 2^20925855 is an apocalyptic number.

20925855 is a deficient number, since it is larger than the sum of its proper divisors (15345705).

20925855 is a wasteful number, since it uses less digits than its factorization.

20925855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465030 (or 465027 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 20925855 is about 4574.4786588200. The cubic root of 20925855 is about 275.5673356468.

The spelling of 20925855 in words is "twenty million, nine hundred twenty-five thousand, eight hundred fifty-five".