31338220 has 24 divisors (see below), whose sum is σ = 69274800. Its totient is φ = 11875392.

The previous prime is 31338173. The next prime is 31338221. The reversal of 31338220 is 2283313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31338191 and 31338200.

It is not an unprimeable number, because it can be changed into a prime (31338221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40855 + ... + 41614.

It is an arithmetic number, because the mean of its divisors is an integer number (2886450).

Almost surely, 2^31338220 is an apocalyptic number.

It is an amenable number.

31338220 is an abundant number, since it is smaller than the sum of its proper divisors (37936580).

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

31338220 is a wasteful number, since it uses less digits than its factorization.

31338220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82497 (or 82495 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 31338220 is about 5598.0550193795. The cubic root of 31338220 is about 315.2763846201.

The spelling of 31338220 in words is "thirty-one million, three hundred thirty-eight thousand, two hundred twenty".