20939618880 has 112 divisors (see below), whose sum is σ = 73870352640. Its totient is φ = 5583896064.

The previous prime is 20939618863. The next prime is 20939618951. The reversal of 20939618880 is 8881693902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1203144 + ... + 1220423.

It is an arithmetic number, because the mean of its divisors is an integer number (659556720).

Almost surely, 2^20939618880 is an apocalyptic number.

20939618880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20939618880 is an abundant number, since it is smaller than the sum of its proper divisors (52930733760).

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

20939618880 is a wasteful number, since it uses less digits than its factorization.

20939618880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423593 (or 2423577 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 20939618880 in words is "twenty billion, nine hundred thirty-nine million, six hundred eighteen thousand, eight hundred eighty".