20397525715044 has 135 divisors (see below), whose sum is σ = 53991209561443. Its totient is φ = 6715035414288.

The previous prime is 20397525715033. The next prime is 20397525715079. The reversal of 20397525715044 is 44051752579302.

The square root of 20397525715044 is 4516362.

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

20397525715044 is a `hidden beast` number, since 2 + 0 + 3 + 9 + 7 + 525 + 71 + 5 + 0 + 44 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6747443317 + ... + 6747446339.

Almost surely, 2^{20397525715044} is an apocalyptic number.

20397525715044 is the 4516362-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20397525715044

20397525715044 is an abundant number, since it is smaller than the sum of its proper divisors (33593683846399).

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

20397525715044 is an frugal number, since it uses more digits than its factorization.

20397525715044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228 (or 3111 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 54.

The spelling of 20397525715044 in words is "twenty trillion, three hundred ninety-seven billion, five hundred twenty-five million, seven hundred fifteen thousand, forty-four".