22730721420 has 192 divisors, whose sum is σ = 76052390400. Its totient is φ = 5007421440.

The previous prime is 22730721413. The next prime is 22730721427. The reversal of 22730721420 is 2412703722.

It is an interprime number because it is at equal distance from previous prime (22730721413) and next prime (22730721427).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (22730721427) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 290451 + ... + 360309.

It is an arithmetic number, because the mean of its divisors is an integer number (396106200).

Almost surely, 2^22730721420 is an apocalyptic number.

22730721420 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 22730721420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38026195200).

22730721420 is an abundant number, since it is smaller than the sum of its proper divisors (53321668980).

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

22730721420 is a wasteful number, since it uses less digits than its factorization.

22730721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69928 (or 69926 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The spelling of 22730721420 in words is "twenty-two billion, seven hundred thirty million, seven hundred twenty-one thousand, four hundred twenty".