20809164835 has 16 divisors (see below), whose sum is σ = 25231266720. Its totient is φ = 16473990400.

The previous prime is 20809164799. The next prime is 20809164847. The reversal of 20809164835 is 53846190802.

It is not a de Polignac number, because 20809164835 - 2⁷ = 20809164707 is a prime.

It is a super-2 number, since 2×20809164835² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1077696 + ... + 1096834.

It is an arithmetic number, because the mean of its divisors is an integer number (1576954170).

Almost surely, 2^20809164835 is an apocalyptic number.

20809164835 is a deficient number, since it is larger than the sum of its proper divisors (4422101885).

20809164835 is a wasteful number, since it uses less digits than its factorization.

20809164835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21398.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 20809164835 in words is "twenty billion, eight hundred nine million, one hundred sixty-four thousand, eight hundred thirty-five".