20195959677 has 4 divisors (see below), whose sum is σ = 26927946240. Its totient is φ = 13463973116.

The previous prime is 20195959633. The next prime is 20195959681. The reversal of 20195959677 is 77695959102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20195959677 - 2²³ = 20187571069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20195959677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20195959607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365993277 + ... + 3365993282.

It is an arithmetic number, because the mean of its divisors is an integer number (6731986560).

Almost surely, 2^20195959677 is an apocalyptic number.

It is an amenable number.

20195959677 is a deficient number, since it is larger than the sum of its proper divisors (6731986563).

20195959677 is an equidigital number, since it uses as much as digits as its factorization.

20195959677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731986562.

The product of its (nonzero) digits is 10716300, while the sum is 60.

The spelling of 20195959677 in words is "twenty billion, one hundred ninety-five million, nine hundred fifty-nine thousand, six hundred seventy-seven".