20000081988 has 36 divisors (see below), whose sum is σ = 51003169308. Its totient is φ = 6607695360.

The previous prime is 20000081977. The next prime is 20000081999. The reversal of 20000081988 is 88918000002.

It is an interprime number because it is at equal distance from previous prime (20000081977) and next prime (20000081999).

It can be written as a sum of positive squares in 2 ways, for example, as 2808152064 + 17191929924 = 52992^2 + 131118^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2454153 + ... + 2462288.

It is an arithmetic number, because the mean of its divisors is an integer number (1416754703).

Almost surely, 2^20000081988 is an apocalyptic number.

It is an amenable number.

20000081988 is an abundant number, since it is smaller than the sum of its proper divisors (31003087320).

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

20000081988 is a wasteful number, since it uses less digits than its factorization.

20000081988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916564 (or 4916559 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 20000081988 in words is "twenty billion, eighty-one thousand, nine hundred eighty-eight".