20910572169 has 48 divisors (see below), whose sum is σ = 30037862400. Its totient is φ = 12935506176.

The previous prime is 20910572129. The next prime is 20910572201. The reversal of 20910572169 is 96127501902.

It is not a de Polignac number, because 20910572169 - 2⁷ = 20910572041 is a prime.

It is a super-2 number, since 2×20910572169² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20910572169.

It is not an unprimeable number, because it can be changed into a prime (20910572129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20125152 + ... + 20126190.

It is an arithmetic number, because the mean of its divisors is an integer number (625788800).

Almost surely, 2^20910572169 is an apocalyptic number.

It is an amenable number.

20910572169 is a deficient number, since it is larger than the sum of its proper divisors (9127290231).

20910572169 is a wasteful number, since it uses less digits than its factorization.

20910572169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 20910572169 in words is "twenty billion, nine hundred ten million, five hundred seventy-two thousand, one hundred sixty-nine".