20078564 has 36 divisors (see below), whose sum is σ = 40745040. Its totient is φ = 8584320.

The previous prime is 20078551. The next prime is 20078579. The reversal of 20078564 is 46587002.

It is a self number, because there is not a number n which added to its sum of digits gives 20078564.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11927 + ... + 13505.

Almost surely, 2^20078564 is an apocalyptic number.

It is an amenable number.

20078564 is an abundant number, since it is smaller than the sum of its proper divisors (20666476).

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

20078564 is a wasteful number, since it uses less digits than its factorization.

20078564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628 (or 1609 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20078564 is about 4480.9110680753. The cubic root of 20078564 is about 271.7967231206.

The spelling of 20078564 in words is "twenty million, seventy-eight thousand, five hundred sixty-four".