402020631 has 32 divisors (see below), whose sum is σ = 619872000. Its totient is φ = 257300064.

The previous prime is 402020629. The next prime is 402020653. The reversal of 402020631 is 136020204.

It is a happy number.

It is not a de Polignac number, because 402020631 - 2¹ = 402020629 is a prime.

It is a super-2 number, since 2×402020631² = 323241175499276322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402000631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65565 + ... + 71433.

It is an arithmetic number, because the mean of its divisors is an integer number (19371000).

Almost surely, 2^402020631 is an apocalyptic number.

402020631 is a deficient number, since it is larger than the sum of its proper divisors (217851369).

402020631 is a wasteful number, since it uses less digits than its factorization.

402020631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980 (or 5974 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 402020631 is about 20050.4521395404. The cubic root of 402020631 is about 738.0448944862.

Adding to 402020631 its reverse (136020204), we get a palindrome (538040835).

The spelling of 402020631 in words is "four hundred two million, twenty thousand, six hundred thirty-one".