20354231 has 2 divisors, whose sum is σ = 20354232. Its totient is φ = 20354230.

The previous prime is 20354221. The next prime is 20354239. The reversal of 20354231 is 13245302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20354231 is a prime.

It is a super-2 number, since 2×20354231² = 828589439202722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177115 + 10177116.

It is an arithmetic number, because the mean of its divisors is an integer number (10177116).

Almost surely, 2^20354231 is an apocalyptic number.

20354231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354231 is an equidigital number, since it uses as much as digits as its factorization.

20354231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20354231 is about 4511.5663577077. The cubic root of 20354231 is about 273.0349438916.

Adding to 20354231 its reverse (13245302), we get a palindrome (33599533).

The spelling of 20354231 in words is "twenty million, three hundred fifty-four thousand, two hundred thirty-one".