20363864 has 16 divisors (see below), whose sum is σ = 38295720. Its totient is φ = 10151680.

The previous prime is 20363857. The next prime is 20363867. The reversal of 20363864 is 46836302.

It is a super-3 number, since 3×20363864³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20363864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20363867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782 + ... + 6429.

Almost surely, 2^20363864 is an apocalyptic number.

It is an amenable number.

20363864 is a deficient number, since it is larger than the sum of its proper divisors (17931856).

20363864 is a wasteful number, since it uses less digits than its factorization.

20363864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7570 (or 7566 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20363864 is about 4512.6338207304. The cubic root of 20363864 is about 273.0780099713.

The spelling of 20363864 in words is "twenty million, three hundred sixty-three thousand, eight hundred sixty-four".