31260420 has 36 divisors (see below), whose sum is σ = 94823820. Its totient is φ = 8336064.

The previous prime is 31260419. The next prime is 31260451. The reversal of 31260420 is 2406213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22581504 + 8678916 = 4752^2 + 2946^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31260393 and 31260402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86655 + ... + 87014.

It is an arithmetic number, because the mean of its divisors is an integer number (2633995).

Almost surely, 2^31260420 is an apocalyptic number.

31260420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31260420 is an abundant number, since it is smaller than the sum of its proper divisors (63563400).

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

31260420 is a wasteful number, since it uses less digits than its factorization.

31260420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173684 (or 173679 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31260420 is about 5591.1018592045. The cubic root of 31260420 is about 315.0152675895.

Adding to 31260420 its reverse (2406213), we get a palindrome (33666633).

The spelling of 31260420 in words is "thirty-one million, two hundred sixty thousand, four hundred twenty".