20823312 has 40 divisors (see below), whose sum is σ = 54197920. Its totient is φ = 6888960.

The previous prime is 20823311. The next prime is 20823331. The reversal of 20823312 is 21332802.

It is a super-2 number, since 2×20823312² = 867220645298688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20823311) 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 7 ways as a sum of consecutive naturals, for example, 5112 + ... + 8232.

It is an arithmetic number, because the mean of its divisors is an integer number (1354948).

Almost surely, 2^20823312 is an apocalyptic number.

It is an amenable number.

20823312 is an abundant number, since it is smaller than the sum of its proper divisors (33374608).

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

20823312 is a wasteful number, since it uses less digits than its factorization.

20823312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271 (or 3265 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20823312 is about 4563.2567317652. The cubic root of 20823312 is about 275.1164773803.

The spelling of 20823312 in words is "twenty million, eight hundred twenty-three thousand, three hundred twelve".