20597688793 has 12 divisors (see below), whose sum is σ = 22728564180. Its totient is φ = 18652282880.

The previous prime is 20597688791. The next prime is 20597688809. The reversal of 20597688793 is 39788679502.

It can be written as a sum of positive squares in 2 ways, for example, as 20251282249 + 346406544 = 142307^2 + 18612^2 .

It is not a de Polignac number, because 20597688793 - 2¹ = 20597688791 is a prime.

It is a super-2 number, since 2×20597688793² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20597688791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300088 + ... + 362281.

It is an arithmetic number, because the mean of its divisors is an integer number (1894047015).

Almost surely, 2^20597688793 is an apocalyptic number.

It is an amenable number.

20597688793 is a deficient number, since it is larger than the sum of its proper divisors (2130875387).

20597688793 is a wasteful number, since it uses less digits than its factorization.

20597688793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662648 (or 662637 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 20597688793 in words is "twenty billion, five hundred ninety-seven million, six hundred eighty-eight thousand, seven hundred ninety-three".