22003902720 has 252 divisors, whose sum is σ = 79026536316. Its totient is φ = 5867458560.

The previous prime is 22003902709. The next prime is 22003902731. The reversal of 22003902720 is 2720930022.

22003902720 is a `hidden beast` number, since 2 + 2 + 0 + 0 + 390 + 272 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (22003902709) and next prime (22003902731).

It can be written as a sum of positive squares in 2 ways, for example, as 6951557376 + 15052345344 = 83376^2 + 122688^2 .

It is a super-2 number, since 2×22003902720² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 921330 + ... + 944910.

Almost surely, 2^22003902720 is an apocalyptic number.

22003902720 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 22003902720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39513268158).

22003902720 is an abundant number, since it is smaller than the sum of its proper divisors (57022633596).

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

22003902720 is an frugal number, since it uses more digits than its factorization.

22003902720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23620 (or 23591 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The spelling of 22003902720 in words is "twenty-two billion, three million, nine hundred two thousand, seven hundred twenty".