20223131 has 4 divisors (see below), whose sum is σ = 20479200. Its totient is φ = 19967064.

The previous prime is 20223109. The next prime is 20223139. The reversal of 20223131 is 13132202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20223131 is a prime.

It is a super-2 number, since 2×20223131² = 817950054886322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20223139) 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, 127916 + ... + 128073.

It is an arithmetic number, because the mean of its divisors is an integer number (5119800).

Almost surely, 2^20223131 is an apocalyptic number.

20223131 is a deficient number, since it is larger than the sum of its proper divisors (256069).

20223131 is an equidigital number, since it uses as much as digits as its factorization.

20223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256068.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20223131 is about 4497.0135645782. The cubic root of 20223131 is about 272.4474819532.

Adding to 20223131 its reverse (13132202), we get a palindrome (33355333).

The spelling of 20223131 in words is "twenty million, two hundred twenty-three thousand, one hundred thirty-one".