20221999956 has 36 divisors (see below), whose sum is σ = 51954706804. Its totient is φ = 6630163200.

The previous prime is 20221999939. The next prime is 20222000009. The reversal of 20221999956 is 65999912202.

It can be written as a sum of positive squares in 2 ways, for example, as 9647168400 + 10574831556 = 98220^2 + 102834^2 .

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

It is a congruent number.

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, 4602085 + ... + 4606476.

Almost surely, 2^20221999956 is an apocalyptic number.

It is an amenable number.

20221999956 is an abundant number, since it is smaller than the sum of its proper divisors (31732706848).

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

20221999956 is a wasteful number, since it uses less digits than its factorization.

20221999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9208632 (or 9208627 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 20221999956 in words is "twenty billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred fifty-six".