20313581697 has 12 divisors (see below), whose sum is σ = 29346003024. Its totient is φ = 13540466520.

The previous prime is 20313581653. The next prime is 20313581723. The reversal of 20313581697 is 79618531302.

20313581697 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 3 + 581 + 69 + 7 = 666.

It is not a de Polignac number, because 20313581697 - 2⁶ = 20313581633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20313581627) 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, 91603 + ... + 221400.

It is an arithmetic number, because the mean of its divisors is an integer number (2445500252).

Almost surely, 2^20313581697 is an apocalyptic number.

It is an amenable number.

20313581697 is a deficient number, since it is larger than the sum of its proper divisors (9032421327).

20313581697 is a wasteful number, since it uses less digits than its factorization.

20313581697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320220 (or 320217 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 20313581697 in words is "twenty billion, three hundred thirteen million, five hundred eighty-one thousand, six hundred ninety-seven".