20423764 has 12 divisors (see below), whose sum is σ = 35872564. Its totient is φ = 10174464.

The previous prime is 20423719. The next prime is 20423771. The reversal of 20423764 is 46732402.

It can be written as a sum of positive squares in 2 ways, for example, as 7246864 + 13176900 = 2692^2 + 3630^2 .

It is a congruent number.

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, 8109 + ... + 10324.

Almost surely, 2^20423764 is an apocalyptic number.

It is an amenable number.

20423764 is a deficient number, since it is larger than the sum of its proper divisors (15448800).

20423764 is a wasteful number, since it uses less digits than its factorization.

20423764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18714 (or 18712 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20423764 is about 4519.2658695855. The cubic root of 20423764 is about 273.3454994915.

The spelling of 20423764 in words is "twenty million, four hundred twenty-three thousand, seven hundred sixty-four".