20143631 has 2 divisors, whose sum is σ = 20143632. Its totient is φ = 20143630.

The previous prime is 20143621. The next prime is 20143633. The reversal of 20143631 is 13634102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20143631 - 2⁶ = 20143567 is a prime.

It is a super-2 number, since 2×20143631² = 811531739728322, which contains 22 as substring.

Together with 20143633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20143633) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071815 + 10071816.

It is an arithmetic number, because the mean of its divisors is an integer number (10071816).

Almost surely, 2^20143631 is an apocalyptic number.

20143631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143631 is an equidigital number, since it uses as much as digits as its factorization.

20143631 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 20.

The square root of 20143631 is about 4488.1656609354. The cubic root of 20143631 is about 272.0900031953.

Adding to 20143631 its reverse (13634102), we get a palindrome (33777733).

The spelling of 20143631 in words is "twenty million, one hundred forty-three thousand, six hundred thirty-one".