22720507 has 2 divisors, whose sum is σ = 22720508. Its totient is φ = 22720506.

The previous prime is 22720501. The next prime is 22720531. The reversal of 22720507 is 70502722.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22720507 - 2³ = 22720499 is a prime.

It is equal to p_1431736 and since 22720507 and 1431736 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22720501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360253 + 11360254.

It is an arithmetic number, because the mean of its divisors is an integer number (11360254).

Almost surely, 2^22720507 is an apocalyptic number.

22720507 is a deficient number, since it is larger than the sum of its proper divisors (1).

22720507 is an equidigital number, since it uses as much as digits as its factorization.

22720507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 22720507 is about 4766.6032979471. The cubic root of 22720507 is about 283.2300567849.

The spelling of 22720507 in words is "twenty-two million, seven hundred twenty thousand, five hundred seven".