20864744 has 16 divisors (see below), whose sum is σ = 40179300. Its totient is φ = 10150272.

The previous prime is 20864743. The next prime is 20864759. The reversal of 20864744 is 44746802.

It can be written as a sum of positive squares in 2 ways, for example, as 20811844 + 52900 = 4562^2 + 230^2 .

It is not an unprimeable number, because it can be changed into a prime (20864743) 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, 34949 + ... + 35540.

Almost surely, 2^20864744 is an apocalyptic number.

It is an amenable number.

20864744 is a deficient number, since it is larger than the sum of its proper divisors (19314556).

20864744 is a wasteful number, since it uses less digits than its factorization.

20864744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70532 (or 70528 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 20864744 is about 4567.7942160303. The cubic root of 20864744 is about 275.2988222816.

The spelling of 20864744 in words is "twenty million, eight hundred sixty-four thousand, seven hundred forty-four".