22720737 has 16 divisors (see below), whose sum is σ = 33678848. Its totient is φ = 13530240.

The previous prime is 22720679. The next prime is 22720741. The reversal of 22720737 is 73702722.

It is not a de Polignac number, because 22720737 - 2⁶ = 22720673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22720777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8188 + ... + 10605.

It is an arithmetic number, because the mean of its divisors is an integer number (2104928).

Almost surely, 2^22720737 is an apocalyptic number.

It is an amenable number.

22720737 is a deficient number, since it is larger than the sum of its proper divisors (10958111).

22720737 is a wasteful number, since it uses less digits than its factorization.

22720737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18840.

The product of its (nonzero) digits is 8232, while the sum is 30.

The square root of 22720737 is about 4766.6274240809. The cubic root of 22720737 is about 283.2310124956.

The spelling of 22720737 in words is "twenty-two million, seven hundred twenty thousand, seven hundred thirty-seven".