20312981892 has 36 divisors (see below), whose sum is σ = 58681948416. Its totient is φ = 5803709040.

The previous prime is 20312981891. The next prime is 20312981893. The reversal of 20312981892 is 29818921302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20312981891) and next prime (20312981893).

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

It is not an unprimeable number, because it can be changed into a prime (20312981891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40303284 + ... + 40303787.

Almost surely, 2^20312981892 is an apocalyptic number.

It is an amenable number.

20312981892 is an abundant number, since it is smaller than the sum of its proper divisors (38368966524).

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

20312981892 is a wasteful number, since it uses less digits than its factorization.

20312981892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80607088 (or 80607083 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 20312981892 in words is "twenty billion, three hundred twelve million, nine hundred eighty-one thousand, eight hundred ninety-two".