20391106770 has 24 divisors (see below), whose sum is σ = 53016877836. Its totient is φ = 5437628448.

The previous prime is 20391106733. The next prime is 20391106877. The reversal of 20391106770 is 7760119302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18851564601 + 1539542169 = 137301^2 + 39237^2 .

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, 113283837 + ... + 113284016.

Almost surely, 2^20391106770 is an apocalyptic number.

20391106770 is an abundant number, since it is smaller than the sum of its proper divisors (32625771066).

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

20391106770 is a wasteful number, since it uses less digits than its factorization.

20391106770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226567866 (or 226567863 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

It can be divided in two parts, 2039 and 1106770, that added together give a square (1108809 = 1053²).

The spelling of 20391106770 in words is "twenty billion, three hundred ninety-one million, one hundred six thousand, seven hundred seventy".