20722056 has 32 divisors (see below), whose sum is σ = 53071200. Its totient is φ = 6738560.

The previous prime is 20722007. The next prime is 20722073. The reversal of 20722056 is 65022702.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9546 + ... + 11513.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^20722056 is an apocalyptic number.

It is an amenable number.

20722056 is an abundant number, since it is smaller than the sum of its proper divisors (32349144).

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

20722056 is a wasteful number, since it uses less digits than its factorization.

20722056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21109 (or 21105 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20722056 is about 4552.1485037288. The cubic root of 20722056 is about 274.6698230175.

Adding to 20722056 its reverse (65022702), we get a palindrome (85744758).

The spelling of 20722056 in words is "twenty million, seven hundred twenty-two thousand, fifty-six".