22720345 has 8 divisors (see below), whose sum is σ = 27506376. Its totient is φ = 18014976.

The previous prime is 22720319. The next prime is 22720349. The reversal of 22720345 is 54302722.

It can be written as a sum of positive squares in 4 ways, for example, as 24649 + 22695696 = 157^2 + 4764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22720345 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22720349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19542 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (3438297).

Almost surely, 2^22720345 is an apocalyptic number.

It is an amenable number.

22720345 is a deficient number, since it is larger than the sum of its proper divisors (4786031).

22720345 is a wasteful number, since it uses less digits than its factorization.

22720345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40331.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 22720345 is about 4766.5863046839. The cubic root of 22720345 is about 283.2293836283.

The spelling of 22720345 in words is "twenty-two million, seven hundred twenty thousand, three hundred forty-five".