31700120 has 32 divisors (see below), whose sum is σ = 73256400. Its totient is φ = 12336768.

The previous prime is 31700117. The next prime is 31700129. The reversal of 31700120 is 2100713.

It is a junction number, because it is equal to n+sod(n) for n = 31700095 and 31700104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31700129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9230 + ... + 12189.

Almost surely, 2^31700120 is an apocalyptic number.

It is an amenable number.

31700120 is an abundant number, since it is smaller than the sum of its proper divisors (41556280).

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

31700120 is a wasteful number, since it uses less digits than its factorization.

31700120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21467 (or 21463 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 31700120 is about 5630.2859607661. The cubic root of 31700120 is about 316.4853674436.

Adding to 31700120 its reverse (2100713), we get a palindrome (33800833).

The spelling of 31700120 in words is "thirty-one million, seven hundred thousand, one hundred twenty".