31032420 has 24 divisors (see below), whose sum is σ = 86890944. Its totient is φ = 8275296.

The previous prime is 31032413. The next prime is 31032427. The reversal of 31032420 is 2423013.

It is an interprime number because it is at equal distance from previous prime (31032413) and next prime (31032427).

It is a super-2 number, since 2×31032420² = 1926022182112800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31032420.

It is not an unprimeable number, because it can be changed into a prime (31032427) 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 7 ways as a sum of consecutive naturals, for example, 258544 + ... + 258663.

It is an arithmetic number, because the mean of its divisors is an integer number (3620456).

Almost surely, 2^31032420 is an apocalyptic number.

31032420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31032420 is an abundant number, since it is smaller than the sum of its proper divisors (55858524).

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

31032420 is a wasteful number, since it uses less digits than its factorization.

31032420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517219 (or 517217 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31032420 is about 5570.6750039829. The cubic root of 31032420 is about 314.2475362913.

Adding to 31032420 its reverse (2423013), we get a palindrome (33455433).

The spelling of 31032420 in words is "thirty-one million, thirty-two thousand, four hundred twenty".