40020631 has 16 divisors (see below), whose sum is σ = 48533760. Its totient is φ = 32235840.

The previous prime is 40020611. The next prime is 40020637. The reversal of 40020631 is 13602004.

40020631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40020631 - 2⁵ = 40020599 is a prime.

It is a super-2 number, since 2×40020631² = 3203301811276322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020637) 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 in 15 ways as a sum of consecutive naturals, for example, 16275 + ... + 18571.

It is an arithmetic number, because the mean of its divisors is an integer number (3033360).

Almost surely, 2^40020631 is an apocalyptic number.

40020631 is a deficient number, since it is larger than the sum of its proper divisors (8513129).

40020631 is a wasteful number, since it uses less digits than its factorization.

40020631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40020631 is about 6326.1861338408. The cubic root of 40020631 is about 342.0539767524.

Adding to 40020631 its reverse (13602004), we get a palindrome (53622635).

The spelling of 40020631 in words is "forty million, twenty thousand, six hundred thirty-one".