20056721552 has 60 divisors (see below), whose sum is σ = 46763195580. Its totient is φ = 8299323648.

The previous prime is 20056721497. The next prime is 20056721557. The reversal of 20056721552 is 25512765002.

It can be written as a sum of positive squares in 2 ways, for example, as 15679046656 + 4377674896 = 125216^2 + 66164^2 .

It is a super-2 number, since 2×20056721552² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20056721557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418343 + ... + 463814.

It is an arithmetic number, because the mean of its divisors is an integer number (779386593).

Almost surely, 2^20056721552 is an apocalyptic number.

It is an amenable number.

20056721552 is an abundant number, since it is smaller than the sum of its proper divisors (26706474028).

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

20056721552 is a wasteful number, since it uses less digits than its factorization.

20056721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882208 (or 882195 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 20056721552 in words is "twenty billion, fifty-six million, seven hundred twenty-one thousand, five hundred fifty-two".