20802080740 has 36 divisors (see below), whose sum is σ = 50816513916. Its totient is φ = 7132141632.

The previous prime is 20802080711. The next prime is 20802080749. The reversal of 20802080740 is 4708020802.

It can be written as a sum of positive squares in 2 ways, for example, as 3053446564 + 17748634176 = 55258^2 + 133224^2 .

It is a super-2 number, since 2×20802080740² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20802080749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10612327 + ... + 10614286.

It is an arithmetic number, because the mean of its divisors is an integer number (1411569831).

Almost surely, 2^20802080740 is an apocalyptic number.

20802080740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20802080740 is an abundant number, since it is smaller than the sum of its proper divisors (30014433176).

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

20802080740 is a wasteful number, since it uses less digits than its factorization.

20802080740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21226636 (or 21226627 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The spelling of 20802080740 in words is "twenty billion, eight hundred two million, eighty thousand, seven hundred forty".