20415964 has 6 divisors (see below), whose sum is σ = 35727944. Its totient is φ = 10207980.

The previous prime is 20415961. The next prime is 20416021. The reversal of 20415964 is 46951402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2551992 + ... + 2551999.

Almost surely, 2^20415964 is an apocalyptic number.

It is an amenable number.

20415964 is a deficient number, since it is larger than the sum of its proper divisors (15311980).

20415964 is a wasteful number, since it uses less digits than its factorization.

20415964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103995 (or 5103993 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20415964 is about 4518.4028151549. The cubic root of 20415964 is about 273.3106974447.

The spelling of 20415964 in words is "twenty million, four hundred fifteen thousand, nine hundred sixty-four".