20941231 has 2 divisors, whose sum is σ = 20941232. Its totient is φ = 20941230.

The previous prime is 20941199. The next prime is 20941243. The reversal of 20941231 is 13214902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20941231 - 2⁵ = 20941199 is a prime.

It is a super-2 number, since 2×20941231² = 877070311590722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20941831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470615 + 10470616.

It is an arithmetic number, because the mean of its divisors is an integer number (10470616).

Almost surely, 2^20941231 is an apocalyptic number.

20941231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20941231 is an equidigital number, since it uses as much as digits as its factorization.

20941231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20941231 is about 4576.1589788817. The cubic root of 20941231 is about 275.6348133513.

The spelling of 20941231 in words is "twenty million, nine hundred forty-one thousand, two hundred thirty-one".