20078664 has 16 divisors (see below), whose sum is σ = 50196720. Its totient is φ = 6692880.

The previous prime is 20078659. The next prime is 20078671. The reversal of 20078664 is 46687002.

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, 418282 + ... + 418329.

It is an arithmetic number, because the mean of its divisors is an integer number (3137295).

Almost surely, 2^20078664 is an apocalyptic number.

20078664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20078664 is an abundant number, since it is smaller than the sum of its proper divisors (30118056).

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

20078664 is a wasteful number, since it uses less digits than its factorization.

20078664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836620 (or 836616 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20078664 is about 4480.9222265065. The cubic root of 20078664 is about 271.7971743419.

The spelling of 20078664 in words is "twenty million, seventy-eight thousand, six hundred sixty-four".