31143040220 has 48 divisors (see below), whose sum is σ = 68968824960. Its totient is φ = 11779919424.

The previous prime is 31143040213. The next prime is 31143040241. The reversal of 31143040220 is 2204034113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31143040192 and 31143040201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132947 + ... + 282773.

It is an arithmetic number, because the mean of its divisors is an integer number (1436850520).

Almost surely, 2^31143040220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31143040220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34484412480).

31143040220 is an abundant number, since it is smaller than the sum of its proper divisors (37825784740).

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

31143040220 is a wasteful number, since it uses less digits than its factorization.

31143040220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150402 (or 150400 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31143040220 its reverse (2204034113), we get a palindrome (33347074333).

The spelling of 31143040220 in words is "thirty-one billion, one hundred forty-three million, forty thousand, two hundred twenty".