20958774719 has 16 divisors (see below), whose sum is σ = 21715734528. Its totient is φ = 20215242432.

The previous prime is 20958774673. The next prime is 20958774761. The reversal of 20958774719 is 91747785902.

It is a cyclic number.

It is not a de Polignac number, because 20958774719 - 2²⁰ = 20957726143 is a prime.

It is a super-2 number, since 2×20958774719² (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 (20958774769) 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, 7159034 + ... + 7161960.

It is an arithmetic number, because the mean of its divisors is an integer number (1357233408).

Almost surely, 2^20958774719 is an apocalyptic number.

20958774719 is a deficient number, since it is larger than the sum of its proper divisors (756959809).

20958774719 is a wasteful number, since it uses less digits than its factorization.

20958774719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134.

The product of its (nonzero) digits is 8890560, while the sum is 59.

The spelling of 20958774719 in words is "twenty billion, nine hundred fifty-eight million, seven hundred seventy-four thousand, seven hundred nineteen".