31143204220 has 24 divisors (see below), whose sum is σ = 65542002624. Its totient is φ = 12430372416.

The previous prime is 31143204203. The next prime is 31143204223. The reversal of 31143204220 is 2240234113.

It is a junction number, because it is equal to n+sod(n) for n = 31143204191 and 31143204200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1672339 + ... + 1690858.

It is an arithmetic number, because the mean of its divisors is an integer number (2730916776).

Almost surely, 2^31143204220 is an apocalyptic number.

It is an amenable number.

31143204220 is an abundant number, since it is smaller than the sum of its proper divisors (34398798404).

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

31143204220 is a wasteful number, since it uses less digits than its factorization.

31143204220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363669 (or 3363667 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31143204220 its reverse (2240234113), we get a palindrome (33383438333).

The spelling of 31143204220 in words is "thirty-one billion, one hundred forty-three million, two hundred four thousand, two hundred twenty".