20981962896 has 40 divisors (see below), whose sum is σ = 54367201824. Its totient is φ = 6972852480.

The previous prime is 20981962891. The next prime is 20981962901. The reversal of 20981962896 is 69826918902.

It is an interprime number because it is at equal distance from previous prime (20981962891) and next prime (20981962901).

It is not an unprimeable number, because it can be changed into a prime (20981962891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644421 + ... + 676196.

Almost surely, 2^20981962896 is an apocalyptic number.

It is an amenable number.

20981962896 is an abundant number, since it is smaller than the sum of its proper divisors (33385238928).

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

20981962896 is a wasteful number, since it uses less digits than its factorization.

20981962896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320959 (or 1320953 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 60.

The spelling of 20981962896 in words is "twenty billion, nine hundred eighty-one million, nine hundred sixty-two thousand, eight hundred ninety-six".