20812572 has 48 divisors (see below), whose sum is σ = 58867200. Its totient is φ = 6306480.

The previous prime is 20812553. The next prime is 20812577. The reversal of 20812572 is 27521802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812577) 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 15 ways as a sum of consecutive naturals, for example, 7572 + ... + 9947.

It is an arithmetic number, because the mean of its divisors is an integer number (1226400).

Almost surely, 2^20812572 is an apocalyptic number.

20812572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20812572 is an abundant number, since it is smaller than the sum of its proper divisors (38054628).

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

20812572 is a wasteful number, since it uses less digits than its factorization.

20812572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17543 (or 17535 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20812572 is about 4562.0797888682. The cubic root of 20812572 is about 275.0691704789.

The spelling of 20812572 in words is "twenty million, eight hundred twelve thousand, five hundred seventy-two".