20718315738780 has 96 divisors (see below), whose sum is σ = 63289001099520. Its totient is φ = 5022307399680.

The previous prime is 20718315738733. The next prime is 20718315738803. The reversal of 20718315738780 is 8783751381702.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9648951 + ... + 11599089.

It is an arithmetic number, because the mean of its divisors is an integer number (659260428120).

Almost surely, 2^{20718315738780} is an apocalyptic number.

20718315738780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20718315738780 is an abundant number, since it is smaller than the sum of its proper divisors (42570685360740).

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

20718315738780 is a wasteful number, since it uses less digits than its factorization.

20718315738780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966259 (or 1966257 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 60.

The spelling of 20718315738780 in words is "twenty trillion, seven hundred eighteen billion, three hundred fifteen million, seven hundred thirty-eight thousand, seven hundred eighty".