22720437500 has 168 divisors, whose sum is σ = 53450878320. Its totient is φ = 8447400000.

The previous prime is 22720437479. The next prime is 22720437503. The reversal of 22720437500 is 573402722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720437503) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 428687474 + ... + 428687526.

It is an arithmetic number, because the mean of its divisors is an integer number (318159990).

Almost surely, 2^22720437500 is an apocalyptic number.

22720437500 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 22720437500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26725439160).

22720437500 is an abundant number, since it is smaller than the sum of its proper divisors (30730440820).

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

22720437500 is an frugal number, since it uses more digits than its factorization.

22720437500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 32.

The spelling of 22720437500 in words is "twenty-two billion, seven hundred twenty million, four hundred thirty-seven thousand, five hundred".