20959879908 has 60 divisors (see below), whose sum is σ = 53797142000. Its totient is φ = 6351425520.

The previous prime is 20959879907. The next prime is 20959879951. The reversal of 20959879908 is 80997895902.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (20959879901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 116043 + ... + 235341.

Almost surely, 2^20959879908 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20959879908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26898571000).

20959879908 is an abundant number, since it is smaller than the sum of its proper divisors (32837262092).

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

20959879908 is a wasteful number, since it uses less digits than its factorization.

20959879908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119350 (or 119315 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 66.

The spelling of 20959879908 in words is "twenty billion, nine hundred fifty-nine million, eight hundred seventy-nine thousand, nine hundred eight".