20397607009641 has 63 divisors (see below), whose sum is σ = 31255736812941. Its totient is φ = 13305337358904.

The previous prime is 20397607009589. The next prime is 20397607009649. The reversal of 20397607009641 is 14690070679302.

It is a happy number.

The square root of 20397607009641 is 4516371.

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

20397607009641 is a `hidden beast` number, since 2 + 0 + 397 + 60 + 70 + 0 + 96 + 41 = 666.

It is not a de Polignac number, because 20397607009641 - 2¹⁹ = 20397606485353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20397607009649) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 5731273020 + ... + 5731276578.

Almost surely, 2^{20397607009641} is an apocalyptic number.

20397607009641 is the 4516371-st square number.

20397607009641 is the 2258186-th centered octagonal number.

It is an amenable number.

20397607009641 is a deficient number, since it is larger than the sum of its proper divisors (10858129803300).

20397607009641 is an frugal number, since it uses more digits than its factorization.

20397607009641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7230 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 20397607009641 in words is "twenty trillion, three hundred ninety-seven billion, six hundred seven million, nine thousand, six hundred forty-one".