20698988856 has 144 divisors (see below), whose sum is σ = 65183319000. Its totient is φ = 5459021568.

The previous prime is 20698988837. The next prime is 20698988861. The reversal of 20698988856 is 65888989602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 146670 + ... + 250818.

Almost surely, 2^20698988856 is an apocalyptic number.

20698988856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20698988856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32591659500).

20698988856 is an abundant number, since it is smaller than the sum of its proper divisors (44484330144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20698988856 is a wasteful number, since it uses less digits than its factorization.

20698988856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104198 (or 104174 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 69.

The spelling of 20698988856 in words is "twenty billion, six hundred ninety-eight million, nine hundred eighty-eight thousand, eight hundred fifty-six".