22001117720 has 32 divisors (see below), whose sum is σ = 49690761120. Its totient is φ = 8766981120.

The previous prime is 22001117701. The next prime is 22001117767. The reversal of 22001117720 is 2771110022.

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, 1035161 + ... + 1056200.

It is an arithmetic number, because the mean of its divisors is an integer number (1552836285).

Almost surely, 2^22001117720 is an apocalyptic number.

22001117720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001117720 is an abundant number, since it is smaller than the sum of its proper divisors (27689643400).

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

22001117720 is a wasteful number, since it uses less digits than its factorization.

22001117720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091635 (or 2091631 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 22001117720 its reverse (2771110022), we get a palindrome (24772227742).

The spelling of 22001117720 in words is "twenty-two billion, one million, one hundred seventeen thousand, seven hundred twenty".