22920891 has 8 divisors (see below), whose sum is σ = 34927104. Its totient is φ = 13097640.

The previous prime is 22920883. The next prime is 22920907. The reversal of 22920891 is 19802922.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22920891 - 2³ = 22920883 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (22920841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545715 + ... + 545756.

It is an arithmetic number, because the mean of its divisors is an integer number (4365888).

Almost surely, 2^22920891 is an apocalyptic number.

22920891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22920891 is a deficient number, since it is larger than the sum of its proper divisors (12006213).

22920891 is a wasteful number, since it uses less digits than its factorization.

22920891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091481.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 22920891 is about 4787.5767356775. The cubic root of 22920891 is about 284.0602720389.

The spelling of 22920891 in words is "twenty-two million, nine hundred twenty thousand, eight hundred ninety-one".