31461320 has 32 divisors (see below), whose sum is σ = 77224320. Its totient is φ = 11440320.

The previous prime is 31461301. The next prime is 31461341. The reversal of 31461320 is 2316413.

It is a super-2 number, since 2×31461320² = 1979629312284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31461292 and 31461301.

It is an unprimeable number.

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, 35312 + ... + 36191.

It is an arithmetic number, because the mean of its divisors is an integer number (2413260).

Almost surely, 2^31461320 is an apocalyptic number.

It is an amenable number.

31461320 is an abundant number, since it is smaller than the sum of its proper divisors (45763000).

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

31461320 is a wasteful number, since it uses less digits than its factorization.

31461320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71525 (or 71521 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31461320 is about 5609.0391333989. The cubic root of 31461320 is about 315.6886587932.

Adding to 31461320 its reverse (2316413), we get a palindrome (33777733).

The spelling of 31461320 in words is "thirty-one million, four hundred sixty-one thousand, three hundred twenty".