20400976 has 20 divisors (see below), whose sum is σ = 40802944. Its totient is φ = 9871200.

The previous prime is 20400967. The next prime is 20400997. The reversal of 20400976 is 67900402.

20400976 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20070 + ... + 21061.

Almost surely, 2^20400976 is an apocalyptic number.

It is an amenable number.

20400976 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20400976 is a wasteful number, since it uses less digits than its factorization.

20400976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41170 (or 41164 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20400976 is about 4516.7439599782. The cubic root of 20400976 is about 273.2437990840.

The spelling of 20400976 in words is "twenty million, four hundred thousand, nine hundred seventy-six".