20822231 has 4 divisors (see below), whose sum is σ = 21385032. Its totient is φ = 20259432.

The previous prime is 20822227. The next prime is 20822257. The reversal of 20822231 is 13222802.

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 20822231 - 2² = 20822227 is a prime.

It is a super-2 number, since 2×20822231² = 867130607634722, 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 (20822201) 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, 281345 + ... + 281418.

It is an arithmetic number, because the mean of its divisors is an integer number (5346258).

Almost surely, 2^20822231 is an apocalyptic number.

20822231 is a deficient number, since it is larger than the sum of its proper divisors (562801).

20822231 is an equidigital number, since it uses as much as digits as its factorization.

20822231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562800.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20822231 is about 4563.1382841198. The cubic root of 20822231 is about 275.1117165933. Note that the first 3 decimals are identical.

The spelling of 20822231 in words is "twenty million, eight hundred twenty-two thousand, two hundred thirty-one".