20873694720 has 80 divisors (see below), whose sum is σ = 66730617360. Its totient is φ = 5566316544.

The previous prime is 20873694719. The next prime is 20873694731. The reversal of 20873694720 is 2749637802.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×20873694720² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20873694720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351285 + ... + 1366644.

It is an arithmetic number, because the mean of its divisors is an integer number (834132717).

Almost surely, 2^20873694720 is an apocalyptic number.

20873694720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20873694720 is an abundant number, since it is smaller than the sum of its proper divisors (45856922640).

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

20873694720 is an equidigital number, since it uses as much as digits as its factorization.

20873694720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717955 (or 2717939 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 20873694720 in words is "twenty billion, eight hundred seventy-three million, six hundred ninety-four thousand, seven hundred twenty".