31380420 has 24 divisors (see below), whose sum is σ = 87865344. Its totient is φ = 8368096.

The previous prime is 31380409. The next prime is 31380431. The reversal of 31380420 is 2408313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31380409) and next prime (31380431).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261444 + ... + 261563.

It is an arithmetic number, because the mean of its divisors is an integer number (3661056).

Almost surely, 2^31380420 is an apocalyptic number.

31380420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31380420 is an abundant number, since it is smaller than the sum of its proper divisors (56484924).

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

31380420 is a wasteful number, since it uses less digits than its factorization.

31380420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523019 (or 523017 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31380420 is about 5601.8229175867. The cubic root of 31380420 is about 315.4178380475.

Adding to 31380420 its reverse (2408313), we get a palindrome (33788733).

The spelling of 31380420 in words is "thirty-one million, three hundred eighty thousand, four hundred twenty".