20981812202 has 32 divisors (see below), whose sum is σ = 34255669392. Its totient is φ = 9580806144.

The previous prime is 20981812193. The next prime is 20981812213. The reversal of 20981812202 is 20221818902.

It is a Cunningham number, because it is equal to 144851²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 3103715521 + 17878096681 = 55711^2 + 133709^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1689038 + ... + 1701414.

Almost surely, 2^20981812202 is an apocalyptic number.

20981812202 is a deficient number, since it is larger than the sum of its proper divisors (13273857190).

20981812202 is a wasteful number, since it uses less digits than its factorization.

20981812202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13082.

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 20981812202 in words is "twenty billion, nine hundred eighty-one million, eight hundred twelve thousand, two hundred two".