22930781 has 4 divisors (see below), whose sum is σ = 22956864. Its totient is φ = 22904700.

The previous prime is 22930771. The next prime is 22930813. The reversal of 22930781 is 18703922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22930781 - 2²² = 18736477 is a prime.

It is a super-2 number, since 2×22930781² = 1051641434539922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22930741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11675 + ... + 13496.

It is an arithmetic number, because the mean of its divisors is an integer number (5739216).

Almost surely, 2^22930781 is an apocalyptic number.

It is an amenable number.

22930781 is a deficient number, since it is larger than the sum of its proper divisors (26083).

22930781 is an equidigital number, since it uses as much as digits as its factorization.

22930781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26082.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 22930781 is about 4788.6095059004. The cubic root of 22930781 is about 284.1011219943.

The spelling of 22930781 in words is "twenty-two million, nine hundred thirty thousand, seven hundred eighty-one".