20113881280 has 56 divisors (see below), whose sum is σ = 49441242240. Its totient is φ = 7786014720.

The previous prime is 20113881253. The next prime is 20113881329. The reversal of 20113881280 is 8218831102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003885 + ... + 1023724.

Almost surely, 2^20113881280 is an apocalyptic number.

20113881280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113881280 is an abundant number, since it is smaller than the sum of its proper divisors (29327360960).

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

20113881280 is a wasteful number, since it uses less digits than its factorization.

20113881280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027657 (or 2027647 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The spelling of 20113881280 in words is "twenty billion, one hundred thirteen million, eight hundred eighty-one thousand, two hundred eighty".