20304287172280 has 64 divisors (see below), whose sum is σ = 46264314096000. Its totient is φ = 8018668929024.

The previous prime is 20304287172217. The next prime is 20304287172311. The reversal of 20304287172280 is 8227178240302.

It is a self number, because there is not a number n which added to its sum of digits gives 20304287172280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136554616 + ... + 136703224.

It is an arithmetic number, because the mean of its divisors is an integer number (722879907750).

Almost surely, 2^{20304287172280} is an apocalyptic number.

20304287172280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20304287172280 is an abundant number, since it is smaller than the sum of its proper divisors (25960026923720).

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

20304287172280 is a wasteful number, since it uses less digits than its factorization.

20304287172280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191936 (or 191932 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 46.

The spelling of 20304287172280 in words is "twenty trillion, three hundred four billion, two hundred eighty-seven million, one hundred seventy-two thousand, two hundred eighty".