20344457956 has 9 divisors (see below), whose sum is σ = 35603300649. Its totient is φ = 10172086344.

The previous prime is 20344457953. The next prime is 20344457981. The reversal of 20344457956 is 65975444302.

The square root of 20344457956 is 142634.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5014056100 + 15330401856 = 70810^2 + 123816^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344457951) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 249610 + ... + 320926.

Almost surely, 2^20344457956 is an apocalyptic number.

20344457956 is the 142634-th square number.

It is an amenable number.

20344457956 is a deficient number, since it is larger than the sum of its proper divisors (15258842693).

20344457956 is an frugal number, since it uses more digits than its factorization.

20344457956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142638 (or 71319 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

Multiplying 20344457956 by its sum of digits (49), we get a square (996878439844 = 998438²).

The spelling of 20344457956 in words is "twenty billion, three hundred forty-four million, four hundred fifty-seven thousand, nine hundred fifty-six".