31343020 has 48 divisors (see below), whose sum is σ = 69870528. Its totient is φ = 11784960.

The previous prime is 31342991. The next prime is 31343023. The reversal of 31343020 is 2034313.

It is a junction number, because it is equal to n+sod(n) for n = 31342985 and 31343003.

It is not an unprimeable number, because it can be changed into a prime (31343023) 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, 27502 + ... + 28618.

It is an arithmetic number, because the mean of its divisors is an integer number (1455636).

Almost surely, 2^31343020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31343020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34935264).

31343020 is an abundant number, since it is smaller than the sum of its proper divisors (38527508).

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

31343020 is a wasteful number, since it uses less digits than its factorization.

31343020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 31343020 is about 5598.4837232951. The cubic root of 31343020 is about 315.2924805076.

Adding to 31343020 its reverse (2034313), we get a palindrome (33377333).

The spelling of 31343020 in words is "thirty-one million, three hundred forty-three thousand, twenty".