20431222 has 32 divisors (see below), whose sum is σ = 36951552. Its totient is φ = 8283264.

The previous prime is 20431219. The next prime is 20431223. The reversal of 20431222 is 22213402.

It is a junction number, because it is equal to n+sod(n) for n = 20431196 and 20431205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34158 + ... + 34750.

It is an arithmetic number, because the mean of its divisors is an integer number (1154736).

Almost surely, 2^20431222 is an apocalyptic number.

20431222 is a deficient number, since it is larger than the sum of its proper divisors (16520330).

20431222 is a wasteful number, since it uses less digits than its factorization.

20431222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

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

The square root of 20431222 is about 4520.0909282889. The cubic root of 20431222 is about 273.3787673169.

Adding to 20431222 its reverse (22213402), we get a palindrome (42644624).

The spelling of 20431222 in words is "twenty million, four hundred thirty-one thousand, two hundred twenty-two".