42020631 has 12 divisors (see below), whose sum is σ = 60811608. Its totient is φ = 27960624.

The previous prime is 42020621. The next prime is 42020639. The reversal of 42020631 is 13602024.

It is a happy number.

It is not a de Polignac number, because 42020631 - 2⁵ = 42020599 is a prime.

It is a super-2 number, since 2×42020631² = 3531466859276322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (5067634).

Almost surely, 2^42020631 is an apocalyptic number.

42020631 is a deficient number, since it is larger than the sum of its proper divisors (18790977).

42020631 is a wasteful number, since it uses less digits than its factorization.

42020631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8862 (or 8859 counting only the distinct ones).

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

The square root of 42020631 is about 6482.3322191940. The cubic root of 42020631 is about 347.6595709701.

Adding to 42020631 its reverse (13602024), we get a palindrome (55622655).

The spelling of 42020631 in words is "forty-two million, twenty thousand, six hundred thirty-one".