20020631 has 2 divisors, whose sum is σ = 20020632. Its totient is φ = 20020630.

The previous prime is 20020619. The next prime is 20020633. The reversal of 20020631 is 13602002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20020631 - 2¹⁰ = 20019607 is a prime.

It is a super-2 number, since 2×20020631² = 801651331276322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 20020633, 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 (20020633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010315 + 10010316.

It is an arithmetic number, because the mean of its divisors is an integer number (10010316).

Almost surely, 2^20020631 is an apocalyptic number.

20020631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020631 is an equidigital number, since it uses as much as digits as its factorization.

20020631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20020631 is about 4474.4419763810. The cubic root of 20020631 is about 271.5350648343.

Adding to 20020631 its reverse (13602002), we get a palindrome (33622633).

The spelling of 20020631 in words is "twenty million, twenty thousand, six hundred thirty-one".