20969643929577 has 16 divisors (see below), whose sum is σ = 31956758827392. Its totient is φ = 11981522787840.

The previous prime is 20969643929503. The next prime is 20969643929579. The reversal of 20969643929577 is 77592934696902.

It is not a de Polignac number, because 20969643929577 - 2²⁷ = 20969509711849 is a prime.

It is a super-2 number, since 2×20969643929577² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20969643929579) 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, 46892424 + ... + 47337497.

It is an arithmetic number, because the mean of its divisors is an integer number (1997297426712).

Almost surely, 2^{20969643929577} is an apocalyptic number.

It is an amenable number.

20969643929577 is a deficient number, since it is larger than the sum of its proper divisors (10987114897815).

20969643929577 is a wasteful number, since it uses less digits than its factorization.

20969643929577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94240528.

The product of its (nonzero) digits is 2777664960, while the sum is 78.

The spelling of 20969643929577 in words is "twenty trillion, nine hundred sixty-nine billion, six hundred forty-three million, nine hundred twenty-nine thousand, five hundred seventy-seven".