20397258488456 has 32 divisors (see below), whose sum is σ = 38872528944600. Its totient is φ = 10031256829440.

The previous prime is 20397258488413. The next prime is 20397258488459. The reversal of 20397258488456 is 65488485279302.

It can be written as a sum of positive squares in 4 ways, for example, as 4484610936100 + 15912647552356 = 2117690^2 + 3989066^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20397258488456.

It is not an unprimeable number, because it can be changed into a prime (20397258488459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28896626 + ... + 29594078.

Almost surely, 2^{20397258488456} is an apocalyptic number.

It is an amenable number.

20397258488456 is a deficient number, since it is larger than the sum of its proper divisors (18475270456144).

20397258488456 is a wasteful number, since it uses less digits than its factorization.

20397258488456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757449 (or 757445 counting only the distinct ones).

The product of its (nonzero) digits is 928972800, while the sum is 71.

The spelling of 20397258488456 in words is "twenty trillion, three hundred ninety-seven billion, two hundred fifty-eight million, four hundred eighty-eight thousand, four hundred fifty-six".