31222020 has 48 divisors (see below), whose sum is σ = 87716160. Its totient is φ = 8297856.

The previous prime is 31221977. The next prime is 31222021. The reversal of 31222020 is 2022213.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31221987 and 31222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22054 + ... + 23426.

It is an arithmetic number, because the mean of its divisors is an integer number (1827420).

Almost surely, 2^31222020 is an apocalyptic number.

31222020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31222020 is an abundant number, since it is smaller than the sum of its proper divisors (56494140).

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

31222020 is a wasteful number, since it uses less digits than its factorization.

31222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 31222020 is about 5587.6667760345. Note that the first 3 decimals coincide. The cubic root of 31222020 is about 314.8862274938.

Adding to 31222020 its reverse (2022213), we get a palindrome (33244233).

The spelling of 31222020 in words is "thirty-one million, two hundred twenty-two thousand, twenty".