22356813 has 4 divisors (see below), whose sum is σ = 29809088. Its totient is φ = 14904540.

The previous prime is 22356799. The next prime is 22356823. The reversal of 22356813 is 31865322.

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 not a de Polignac number, because 22356813 - 2⁵ = 22356781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22356823) 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, 3726133 + ... + 3726138.

It is an arithmetic number, because the mean of its divisors is an integer number (7452272).

Almost surely, 2^22356813 is an apocalyptic number.

It is an amenable number.

22356813 is a deficient number, since it is larger than the sum of its proper divisors (7452275).

22356813 is an equidigital number, since it uses as much as digits as its factorization.

22356813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452274.

The product of its digits is 8640, while the sum is 30.

The square root of 22356813 is about 4728.2991656620. The cubic root of 22356813 is about 281.7106710112.

The spelling of 22356813 in words is "twenty-two million, three hundred fifty-six thousand, eight hundred thirteen".