20885685435 has 64 divisors (see below), whose sum is σ = 37967155200. Its totient is φ = 10890681984.

The previous prime is 20885685413. The next prime is 20885685449. The reversal of 20885685435 is 53458658802.

20885685435 is a `hidden beast` number, since 2 + 0 + 88 + 56 + 85 + 435 = 666.

It is not a de Polignac number, because 20885685435 - 2⁷ = 20885685307 is a prime.

It is a super-2 number, since 2×20885685435² (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 63 ways as a sum of consecutive naturals, for example, 1088989 + ... + 1108001.

It is an arithmetic number, because the mean of its divisors is an integer number (593236800).

Almost surely, 2^20885685435 is an apocalyptic number.

20885685435 is a deficient number, since it is larger than the sum of its proper divisors (17081469765).

20885685435 is a wasteful number, since it uses less digits than its factorization.

20885685435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19209 (or 19203 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 54.

The spelling of 20885685435 in words is "twenty billion, eight hundred eighty-five million, six hundred eighty-five thousand, four hundred thirty-five".