22420231 has 4 divisors (see below), whose sum is σ = 22536592. Its totient is φ = 22303872.

The previous prime is 22420213. The next prime is 22420241. The reversal of 22420231 is 13202422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13202422 = 2 ⋅6601211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22420231 is a prime.

It is a super-2 number, since 2×22420231² = 1005333516186722, 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 (22420201) 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, 57891 + ... + 58276.

It is an arithmetic number, because the mean of its divisors is an integer number (5634148).

Almost surely, 2^22420231 is an apocalyptic number.

22420231 is a deficient number, since it is larger than the sum of its proper divisors (116361).

22420231 is a wasteful number, since it uses less digits than its factorization.

22420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116360.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 22420231 is about 4735.0006335797. Note that the first 3 decimals coincide. The cubic root of 22420231 is about 281.9767891632.

Adding to 22420231 its reverse (13202422), we get a palindrome (35622653).

The spelling of 22420231 in words is "twenty-two million, four hundred twenty thousand, two hundred thirty-one".