20940803280 has 90 divisors (see below), whose sum is σ = 70339240374. Its totient is φ = 5583178752.

The previous prime is 20940803267. The next prime is 20940803281. The reversal of 20940803280 is 8230804902.

It can be written as a sum of positive squares in 3 ways, for example, as 12621174336 + 8319628944 = 112344^2 + 91212^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20940803281) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3880264 + ... + 3885656.

Almost surely, 2^20940803280 is an apocalyptic number.

20940803280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20940803280 is an abundant number, since it is smaller than the sum of its proper divisors (49398437094).

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

20940803280 is an frugal number, since it uses more digits than its factorization.

20940803280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805 (or 5403 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 20940803280 in words is "twenty billion, nine hundred forty million, eight hundred three thousand, two hundred eighty".