20664164 has 12 divisors (see below), whose sum is σ = 37044588. Its totient is φ = 10080000.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664164 is 46146602.

It can be written as a sum of positive squares in 2 ways, for example, as 4326400 + 16337764 = 2080^2 + 4042^2 .

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, 62837 + ... + 63164.

It is an arithmetic number, because the mean of its divisors is an integer number (3087049).

Almost surely, 2^20664164 is an apocalyptic number.

It is an amenable number.

20664164 is a deficient number, since it is larger than the sum of its proper divisors (16380424).

20664164 is a wasteful number, since it uses less digits than its factorization.

20664164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126046 (or 126044 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20664164 is about 4545.7853006934. The cubic root of 20664164 is about 274.4137992533.

The spelling of 20664164 in words is "twenty million, six hundred sixty-four thousand, one hundred sixty-four".