31022420 has 48 divisors (see below), whose sum is σ = 76543488. Its totient is φ = 10412160.

The previous prime is 31022371. The next prime is 31022429. The reversal of 31022420 is 2422013.

It is a junction number, because it is equal to n+sod(n) for n = 31022395 and 31022404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31022429) 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, 2564 + ... + 8283.

It is an arithmetic number, because the mean of its divisors is an integer number (1594656).

Almost surely, 2^31022420 is an apocalyptic number.

It is an amenable number.

31022420 is an abundant number, since it is smaller than the sum of its proper divisors (45521068).

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

31022420 is a wasteful number, since it uses less digits than its factorization.

31022420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10880 (or 10878 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31022420 is about 5569.7773743661. Note that the first 3 decimals coincide. The cubic root of 31022420 is about 314.2137779081.

Adding to 31022420 its reverse (2422013), we get a palindrome (33444433).

The spelling of 31022420 in words is "thirty-one million, twenty-two thousand, four hundred twenty".