20464816 has 20 divisors (see below), whose sum is σ = 39723400. Its totient is φ = 10213632.

The previous prime is 20464789. The next prime is 20464817. The reversal of 20464816 is 61846402.

It is not an unprimeable number, because it can be changed into a prime (20464817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13000 + ... + 14488.

It is an arithmetic number, because the mean of its divisors is an integer number (1986170).

Almost surely, 2^20464816 is an apocalyptic number.

It is an amenable number.

20464816 is a deficient number, since it is larger than the sum of its proper divisors (19258584).

20464816 is a wasteful number, since it uses less digits than its factorization.

20464816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20464816 is about 4523.8054776924. The cubic root of 20464816 is about 273.5285194524.

The spelling of 20464816 in words is "twenty million, four hundred sixty-four thousand, eight hundred sixteen".