20133431 has 2 divisors, whose sum is σ = 20133432. Its totient is φ = 20133430.

The previous prime is 20133413. The next prime is 20133479. The reversal of 20133431 is 13433102.

It is a happy number.

Together with previous prime (20133413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20133431 - 2¹⁰ = 20132407 is a prime.

It is a super-4 number, since 4×20133431⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20133401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066715 + 10066716.

It is an arithmetic number, because the mean of its divisors is an integer number (10066716).

Almost surely, 2^20133431 is an apocalyptic number.

20133431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133431 is an equidigital number, since it uses as much as digits as its factorization.

20133431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 20133431 is about 4487.0291953586. The cubic root of 20133431 is about 272.0440699571.

Adding to 20133431 its reverse (13433102), we get a palindrome (33566533).

The spelling of 20133431 in words is "twenty million, one hundred thirty-three thousand, four hundred thirty-one".