31220442220 has 48 divisors (see below), whose sum is σ = 71693296416. Its totient is φ = 11325888000.

The previous prime is 31220442179. The next prime is 31220442229. The reversal of 31220442220 is 2224402213.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31220442191 and 31220442200.

It is not an unprimeable number, because it can be changed into a prime (31220442229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75921 + ... + 261160.

It is an arithmetic number, because the mean of its divisors is an integer number (1493610342).

Almost surely, 2^31220442220 is an apocalyptic number.

It is an amenable number.

31220442220 is an abundant number, since it is smaller than the sum of its proper divisors (40472854196).

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

31220442220 is a wasteful number, since it uses less digits than its factorization.

31220442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337522 (or 337520 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 31220442220 its reverse (2224402213), we get a palindrome (33444844433).

The spelling of 31220442220 in words is "thirty-one billion, two hundred twenty million, four hundred forty-two thousand, two hundred twenty".