20715620641860 has 48 divisors (see below), whose sum is σ = 58003948933056. Its totient is φ = 5524145396352.

The previous prime is 20715620641787. The next prime is 20715620641939. The reversal of 20715620641860 is 6814602651702.

It is a super-2 number, since 2×20715620641860² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23914474 + ... + 24765566.

It is an arithmetic number, because the mean of its divisors is an integer number (1208415602772).

Almost surely, 2^{20715620641860} is an apocalyptic number.

20715620641860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20715620641860 is an abundant number, since it is smaller than the sum of its proper divisors (37288328291196).

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

20715620641860 is a wasteful number, since it uses less digits than its factorization.

20715620641860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256772 (or 1256770 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 20715620641860 in words is "twenty trillion, seven hundred fifteen billion, six hundred twenty million, six hundred forty-one thousand, eight hundred sixty".