22420091 has 4 divisors (see below), whose sum is σ = 22433400. Its totient is φ = 22406784.

The previous prime is 22420087. The next prime is 22420117. The reversal of 22420091 is 19002422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19002422 = 2 ⋅9501211.

It is a cyclic number.

It is not a de Polignac number, because 22420091 - 2² = 22420087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22420291) 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, 3686 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (5608350).

Almost surely, 2^22420091 is an apocalyptic number.

22420091 is a deficient number, since it is larger than the sum of its proper divisors (13309).

22420091 is a wasteful number, since it uses less digits than its factorization.

22420091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13308.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22420091 is about 4734.9858500317. The cubic root of 22420091 is about 281.9762022404.

The spelling of 22420091 in words is "twenty-two million, four hundred twenty thousand, ninety-one".