31730022 has 32 divisors (see below), whose sum is σ = 71042400. Its totient is φ = 10497024.

The previous prime is 31730003. The next prime is 31730047. The reversal of 31730022 is 22003713.

It is a super-2 number, since 2×31730022² = 2013588592240968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31729977 and 31730004.

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, 5254 + ... + 9542.

It is an arithmetic number, because the mean of its divisors is an integer number (2220075).

Almost surely, 2^31730022 is an apocalyptic number.

31730022 is an abundant number, since it is smaller than the sum of its proper divisors (39312378).

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

31730022 is a wasteful number, since it uses less digits than its factorization.

31730022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437 (or 4431 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31730022 is about 5632.9407950022. The cubic root of 31730022 is about 316.5848473134.

Adding to 31730022 its reverse (22003713), we get a palindrome (53733735).

The spelling of 31730022 in words is "thirty-one million, seven hundred thirty thousand, twenty-two".