22545731 has 16 divisors (see below), whose sum is σ = 25468800. Its totient is φ = 19813248.

The previous prime is 22545709. The next prime is 22545739. The reversal of 22545731 is 13754522.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-22545731 is a prime.

It is a super-2 number, since 2×22545731² = 1016619972648722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22545694 and 22545703.

It is not an unprimeable number, because it can be changed into a prime (22545739) 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, 29405 + ... + 30161.

It is an arithmetic number, because the mean of its divisors is an integer number (1591800).

Almost surely, 2^22545731 is an apocalyptic number.

22545731 is a deficient number, since it is larger than the sum of its proper divisors (2923069).

22545731 is a wasteful number, since it uses less digits than its factorization.

22545731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878.

The product of its digits is 8400, while the sum is 29.

The square root of 22545731 is about 4748.2345140062. The cubic root of 22545731 is about 282.5019437567.

The spelling of 22545731 in words is "twenty-two million, five hundred forty-five thousand, seven hundred thirty-one".