22720351 has 2 divisors, whose sum is σ = 22720352. Its totient is φ = 22720350.

The previous prime is 22720349. The next prime is 22720361. The reversal of 22720351 is 15302722.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22720351 - 2¹ = 22720349 is a prime.

Together with 22720349, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1431724 and since 22720351 and 1431724 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22720361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360175 + 11360176.

It is an arithmetic number, because the mean of its divisors is an integer number (11360176).

Almost surely, 2^22720351 is an apocalyptic number.

22720351 is a deficient number, since it is larger than the sum of its proper divisors (1).

22720351 is an equidigital number, since it uses as much as digits as its factorization.

22720351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 22720351 is about 4766.5869340651. The cubic root of 22720351 is about 283.2294085601.

The spelling of 22720351 in words is "twenty-two million, seven hundred twenty thousand, three hundred fifty-one".