20783264 has 24 divisors (see below), whose sum is σ = 43071840. Its totient is φ = 9844416.

The previous prime is 20783239. The next prime is 20783267. The reversal of 20783264 is 46238702.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20783264.

It is not an unprimeable number, because it can be changed into a prime (20783267) 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, 16484 + ... + 17699.

It is an arithmetic number, because the mean of its divisors is an integer number (1794660).

Almost surely, 2^20783264 is an apocalyptic number.

It is an amenable number.

20783264 is an abundant number, since it is smaller than the sum of its proper divisors (22288576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20783264 is a wasteful number, since it uses less digits than its factorization.

20783264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34212 (or 34204 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20783264 is about 4558.8665257934. The cubic root of 20783264 is about 274.9399935188.

The spelling of 20783264 in words is "twenty million, seven hundred eighty-three thousand, two hundred sixty-four".