20925928 has 32 divisors (see below), whose sum is σ = 40298760. Its totient is φ = 10183680.

The previous prime is 20925923. The next prime is 20925967. The reversal of 20925928 is 82952902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6041764 + 14884164 = 2458^2 + 3858^2 .

It is a super-2 number, since 2×20925928² = 875788925322368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20925923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66700 + ... + 67012.

Almost surely, 2^20925928 is an apocalyptic number.

It is an amenable number.

20925928 is a deficient number, since it is larger than the sum of its proper divisors (19372832).

20925928 is a wasteful number, since it uses less digits than its factorization.

20925928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 20925928 is about 4574.4866378644. The cubic root of 20925928 is about 275.5676560860.

The spelling of 20925928 in words is "twenty million, nine hundred twenty-five thousand, nine hundred twenty-eight".