20434231 has 2 divisors, whose sum is σ = 20434232. Its totient is φ = 20434230.

The previous prime is 20434223. The next prime is 20434247. The reversal of 20434231 is 13243402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20434231 - 2³ = 20434223 is a prime.

It is a super-2 number, since 2×20434231² = 835115593122722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20434199 and 20434208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20234231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217115 + 10217116.

It is an arithmetic number, because the mean of its divisors is an integer number (10217116).

Almost surely, 2^20434231 is an apocalyptic number.

20434231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434231 is an equidigital number, since it uses as much as digits as its factorization.

20434231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20434231 is about 4520.4237633213. The cubic root of 20434231 is about 273.3921872408.

Adding to 20434231 its reverse (13243402), we get a palindrome (33677633).

The spelling of 20434231 in words is "twenty million, four hundred thirty-four thousand, two hundred thirty-one".