20422231 has 4 divisors (see below), whose sum is σ = 20444112. Its totient is φ = 20400352.

The previous prime is 20422189. The next prime is 20422243. The reversal of 20422231 is 13222402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20422231 - 2⁹ = 20421719 is a prime.

It is a super-2 number, since 2×20422231² = 834135038034722, 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 (20423231) 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, 9475 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (5111028).

Almost surely, 2^20422231 is an apocalyptic number.

20422231 is a deficient number, since it is larger than the sum of its proper divisors (21881).

20422231 is an equidigital number, since it uses as much as digits as its factorization.

20422231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21880.

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

The square root of 20422231 is about 4519.0962592094. The cubic root of 20422231 is about 273.3386602505.

Adding to 20422231 its reverse (13222402), we get a palindrome (33644633).

The spelling of 20422231 in words is "twenty million, four hundred twenty-two thousand, two hundred thirty-one".