31230420 has 48 divisors (see below), whose sum is σ = 94174080. Its totient is φ = 7687296.

The previous prime is 31230413. The next prime is 31230421. The reversal of 31230420 is 2403213.

It is a super-3 number, since 3×31230420³ (a number of 23 digits) contains 333 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 31230420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230421) 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, 19240 + ... + 20799.

It is an arithmetic number, because the mean of its divisors is an integer number (1961960).

Almost surely, 2^31230420 is an apocalyptic number.

31230420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31230420 is an abundant number, since it is smaller than the sum of its proper divisors (62943660).

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

31230420 is a wasteful number, since it uses less digits than its factorization.

31230420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40064 (or 40062 counting only the distinct ones).

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

The square root of 31230420 is about 5588.4183809017. The cubic root of 31230420 is about 314.9144640518.

Adding to 31230420 its reverse (2403213), we get a palindrome (33633633).

The spelling of 31230420 in words is "thirty-one million, two hundred thirty thousand, four hundred twenty".