20950995870177 has 4 divisors (see below), whose sum is σ = 27934661160240. Its totient is φ = 13967330580116.

The previous prime is 20950995870169. The next prime is 20950995870223. The reversal of 20950995870177 is 77107859905902.

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 20950995870177 - 2³ = 20950995870169 is a prime.

It is a super-2 number, since 2×20950995870177² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20950995870127) 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, 3491832645027 + ... + 3491832645032.

It is an arithmetic number, because the mean of its divisors is an integer number (6983665290060).

Almost surely, 2^{20950995870177} is an apocalyptic number.

It is an amenable number.

20950995870177 is a deficient number, since it is larger than the sum of its proper divisors (6983665290063).

20950995870177 is an equidigital number, since it uses as much as digits as its factorization.

20950995870177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983665290062.

The product of its (nonzero) digits is 100018800, while the sum is 69.

The spelling of 20950995870177 in words is "twenty trillion, nine hundred fifty billion, nine hundred ninety-five million, eight hundred seventy thousand, one hundred seventy-seven".