42020436631 has 4 divisors (see below), whose sum is σ = 42813275112. Its totient is φ = 41227598152.

The previous prime is 42020436607. The next prime is 42020436641. The reversal of 42020436631 is 13663402024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42020436631 - 2⁵ = 42020436599 is a prime.

It is a super-2 number, since 2×42020436631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42020436593 and 42020436602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020436641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396419161 + ... + 396419266.

It is an arithmetic number, because the mean of its divisors is an integer number (10703318778).

Almost surely, 2^42020436631 is an apocalyptic number.

42020436631 is a deficient number, since it is larger than the sum of its proper divisors (792838481).

42020436631 is an equidigital number, since it uses as much as digits as its factorization.

42020436631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792838480.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 42020436631 its reverse (13663402024), we get a palindrome (55683838655).

The spelling of 42020436631 in words is "forty-two billion, twenty million, four hundred thirty-six thousand, six hundred thirty-one".