20415920 has 40 divisors (see below), whose sum is σ = 54249504. Its totient is φ = 6999552.

The previous prime is 20415919. The next prime is 20415931. The reversal of 20415920 is 2951402.

It is a tau number, because it is divible by the number of its divisors (40).

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, 17669 + ... + 18788.

Almost surely, 2^20415920 is an apocalyptic number.

20415920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20415920 is an abundant number, since it is smaller than the sum of its proper divisors (33833584).

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

20415920 is a wasteful number, since it uses less digits than its factorization.

20415920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36477 (or 36471 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20415920 is about 4518.3979461752. The cubic root of 20415920 is about 273.3105011003.

The spelling of 20415920 in words is "twenty million, four hundred fifteen thousand, nine hundred twenty".