31443242020 has 24 divisors (see below), whose sum is σ = 66217879224. Its totient is φ = 12541664256.

The previous prime is 31443242011. The next prime is 31443242023. The reversal of 31443242020 is 2024234413.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1669049316 + 29774192704 = 40854^2 + 172552^2 .

It is not an unprimeable number, because it can be changed into a prime (31443242023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2219799 + ... + 2233918.

It is an arithmetic number, because the mean of its divisors is an integer number (2759078301).

Almost surely, 2^31443242020 is an apocalyptic number.

It is an amenable number.

31443242020 is an abundant number, since it is smaller than the sum of its proper divisors (34774637204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31443242020 is a wasteful number, since it uses less digits than its factorization.

31443242020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454079 (or 4454077 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 31443242020 its reverse (2024234413), we get a palindrome (33467476433).

The spelling of 31443242020 in words is "thirty-one billion, four hundred forty-three million, two hundred forty-two thousand, twenty".