22781505720 has 32 divisors (see below), whose sum is σ = 68344517520. Its totient is φ = 6075068160.

The previous prime is 22781505697. The next prime is 22781505739. The reversal of 22781505720 is 2750518722.

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, 94922821 + ... + 94923060.

Almost surely, 2^22781505720 is an apocalyptic number.

22781505720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22781505720 is an abundant number, since it is smaller than the sum of its proper divisors (45563011800).

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

22781505720 is a wasteful number, since it uses less digits than its factorization.

22781505720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189845895 (or 189845891 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 22781505720 in words is "twenty-two billion, seven hundred eighty-one million, five hundred five thousand, seven hundred twenty".