31117420 has 24 divisors (see below), whose sum is σ = 65649024. Its totient is φ = 12389376.

The previous prime is 31117417. The next prime is 31117439. The reversal of 31117420 is 2471113.

It is an unprimeable number.

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, 972 + ... + 7948.

It is an arithmetic number, because the mean of its divisors is an integer number (2735376).

Almost surely, 2^31117420 is an apocalyptic number.

It is an amenable number.

31117420 is an abundant number, since it is smaller than the sum of its proper divisors (34531604).

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

31117420 is a wasteful number, since it uses less digits than its factorization.

31117420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209 (or 7207 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31117420 is about 5578.2990238961. The cubic root of 31117420 is about 314.5341901607.

Adding to 31117420 its reverse (2471113), we get a palindrome (33588533).

The spelling of 31117420 in words is "thirty-one million, one hundred seventeen thousand, four hundred twenty".