20135431 has 2 divisors, whose sum is σ = 20135432. Its totient is φ = 20135430.

The previous prime is 20135377. The next prime is 20135447. The reversal of 20135431 is 13453102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20135431 - 2¹⁹ = 19611143 is a prime.

It is a super-2 number, since 2×20135431² = 810871163111522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20135399 and 20135408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20133431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10067715 + 10067716.

It is an arithmetic number, because the mean of its divisors is an integer number (10067716).

Almost surely, 2^20135431 is an apocalyptic number.

20135431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20135431 is an equidigital number, since it uses as much as digits as its factorization.

20135431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20135431 is about 4487.2520544315. The cubic root of 20135431 is about 272.0530776969.

Adding to 20135431 its reverse (13453102), we get a palindrome (33588533).

The spelling of 20135431 in words is "twenty million, one hundred thirty-five thousand, four hundred thirty-one".