20620642597 has 4 divisors (see below), whose sum is σ = 20757203296. Its totient is φ = 20484081900.

The previous prime is 20620642577. The next prime is 20620642607. The reversal of 20620642597 is 79524602602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20620642597 is a prime.

It is a super-2 number, since 2×20620642597² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620642577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68280123 + ... + 68280424.

It is an arithmetic number, because the mean of its divisors is an integer number (5189300824).

Almost surely, 2^20620642597 is an apocalyptic number.

It is an amenable number.

20620642597 is a deficient number, since it is larger than the sum of its proper divisors (136560699).

20620642597 is a wasteful number, since it uses less digits than its factorization.

20620642597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136560698.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 20620642597 in words is "twenty billion, six hundred twenty million, six hundred forty-two thousand, five hundred ninety-seven".