20994255802 has 16 divisors (see below), whose sum is σ = 34553683080. Its totient is φ = 9506832192.

The previous prime is 20994255797. The next prime is 20994255809. The reversal of 20994255802 is 20855249902.

It can be written as a sum of positive squares in 4 ways, for example, as 16959592441 + 4034663361 = 130229^2 + 63519^2 .

It is not an unprimeable number, because it can be changed into a prime (20994255809) 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, 7616277 + ... + 7619032.

Almost surely, 2^20994255802 is an apocalyptic number.

20994255802 is a deficient number, since it is larger than the sum of its proper divisors (13559427278).

20994255802 is a wasteful number, since it uses less digits than its factorization.

20994255802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15235377.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 20994255802 in words is "twenty billion, nine hundred ninety-four million, two hundred fifty-five thousand, eight hundred two".