20812221802 has 16 divisors (see below), whose sum is σ = 31806463752. Its totient is φ = 10211891200.

The previous prime is 20812221791. The next prime is 20812221811.

20812221802 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 17339359041 + 3472862761 = 131679^2 + 58931^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433063 + ... + 478714.

Almost surely, 2^20812221802 is an apocalyptic number.

20812221802 is a deficient number, since it is larger than the sum of its proper divisors (10994241950).

20812221802 is a wasteful number, since it uses less digits than its factorization.

20812221802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911993.

The product of its (nonzero) digits is 2048, while the sum is 28.

The spelling of 20812221802 in words is "twenty billion, eight hundred twelve million, two hundred twenty-one thousand, eight hundred two".