20504589280 has 48 divisors (see below), whose sum is σ = 55362394080. Its totient is φ = 7030144512.

The previous prime is 20504589269. The next prime is 20504589283. The reversal of 20504589280 is 8298540502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504589283) 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, 9152715 + ... + 9154954.

It is an arithmetic number, because the mean of its divisors is an integer number (1153383210).

Almost surely, 2^20504589280 is an apocalyptic number.

20504589280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20504589280 is an abundant number, since it is smaller than the sum of its proper divisors (34857804800).

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

20504589280 is a wasteful number, since it uses less digits than its factorization.

20504589280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18307691 (or 18307683 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 20504589280 in words is "twenty billion, five hundred four million, five hundred eighty-nine thousand, two hundred eighty".