20164564 has 24 divisors (see below), whose sum is σ = 40705280. Its totient is φ = 8561376.

The previous prime is 20164561. The next prime is 20164577. The reversal of 20164564 is 46546102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252 + ... + 6355.

Almost surely, 2^20164564 is an apocalyptic number.

It is an amenable number.

20164564 is an abundant number, since it is smaller than the sum of its proper divisors (20540716).

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

20164564 is a wasteful number, since it uses less digits than its factorization.

20164564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727 (or 6725 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20164564 is about 4490.4970771619. The cubic root of 20164564 is about 272.1842213665.

The spelling of 20164564 in words is "twenty million, one hundred sixty-four thousand, five hundred sixty-four".