20517900693 has 16 divisors (see below), whose sum is σ = 28325755200. Its totient is φ = 13195163520.

The previous prime is 20517900691. The next prime is 20517900737. The reversal of 20517900693 is 39600971502.

It is not a de Polignac number, because 20517900693 - 2¹ = 20517900691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517900691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6223 + ... + 202668.

It is an arithmetic number, because the mean of its divisors is an integer number (1770359700).

Almost surely, 2^20517900693 is an apocalyptic number.

It is an amenable number.

20517900693 is a deficient number, since it is larger than the sum of its proper divisors (7807854507).

20517900693 is a wasteful number, since it uses less digits than its factorization.

20517900693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210052.

The product of its (nonzero) digits is 102060, while the sum is 42.

The spelling of 20517900693 in words is "twenty billion, five hundred seventeen million, nine hundred thousand, six hundred ninety-three".