22720566 has 16 divisors (see below), whose sum is σ = 49572288. Its totient is φ = 6885000.

The previous prime is 22720541. The next prime is 22720583. The reversal of 22720566 is 66502722.

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, 172060 + ... + 172191.

It is an arithmetic number, because the mean of its divisors is an integer number (3098268).

Almost surely, 2^22720566 is an apocalyptic number.

22720566 is an abundant number, since it is smaller than the sum of its proper divisors (26851722).

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

22720566 is a wasteful number, since it uses less digits than its factorization.

22720566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344267.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 22720566 is about 4766.6094868365. The cubic root of 22720566 is about 283.2303019461.

The spelling of 22720566 in words is "twenty-two million, seven hundred twenty thousand, five hundred sixty-six".