20711572 has 12 divisors (see below), whose sum is σ = 41423200. Its totient is φ = 8876376.

The previous prime is 20711563. The next prime is 20711573. The reversal of 20711572 is 27511702.

It is a happy number.

20711572 is an admirable number.

It is a super-2 number, since 2×20711572² = 857938429422368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20711573) 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, 369822 + ... + 369877.

Almost surely, 2^20711572 is an apocalyptic number.

It is an amenable number.

20711572 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20711572 is a wasteful number, since it uses less digits than its factorization.

20711572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739710 (or 739708 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20711572 is about 4550.9968138859. The cubic root of 20711572 is about 274.6234935703.

The spelling of 20711572 in words is "twenty million, seven hundred eleven thousand, five hundred seventy-two".