31002420 has 48 divisors (see below), whose sum is σ = 87067008. Its totient is φ = 8242560.

The previous prime is 31002401. The next prime is 31002427. The reversal of 31002420 is 2420013.

It is a super-2 number, since 2×31002420² = 1922300091712800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31002396 and 31002405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31002427) 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 15 ways as a sum of consecutive naturals, for example, 28690 + ... + 29750.

It is an arithmetic number, because the mean of its divisors is an integer number (1813896).

Almost surely, 2^31002420 is an apocalyptic number.

31002420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31002420 is an abundant number, since it is smaller than the sum of its proper divisors (56064588).

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

31002420 is a wasteful number, since it uses less digits than its factorization.

31002420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 31002420 is about 5567.9816810043. The cubic root of 31002420 is about 314.1462393718.

Adding to 31002420 its reverse (2420013), we get a palindrome (33422433).

The spelling of 31002420 in words is "thirty-one million, two thousand, four hundred twenty".