20372021688520 has 64 divisors (see below), whose sum is σ = 46401139008000. Its totient is φ = 8048576076288.

The previous prime is 20372021688511. The next prime is 20372021688547. The reversal of 20372021688520 is 2588612027302.

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, 12263401 + ... + 13825159.

It is an arithmetic number, because the mean of its divisors is an integer number (725017797000).

Almost surely, 2^{20372021688520} is an apocalyptic number.

20372021688520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20372021688520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23200569504000).

20372021688520 is an abundant number, since it is smaller than the sum of its proper divisors (26029117319480).

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

20372021688520 is a wasteful number, since it uses less digits than its factorization.

20372021688520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565782 (or 1565778 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20372021688520 in words is "twenty trillion, three hundred seventy-two billion, twenty-one million, six hundred eighty-eight thousand, five hundred twenty".