31314220 has 48 divisors (see below), whose sum is σ = 76769280. Its totient is φ = 10505664.

The previous prime is 31314197. The next prime is 31314251. The reversal of 31314220 is 2241313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31314194 and 31314203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4201 + ... + 8959.

It is an arithmetic number, because the mean of its divisors is an integer number (1599360).

Almost surely, 2^31314220 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 31314220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38384640).

31314220 is an abundant number, since it is smaller than the sum of its proper divisors (45455060).

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

31314220 is a wasteful number, since it uses less digits than its factorization.

31314220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4822 (or 4820 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31314220 is about 5595.9110071551. The cubic root of 31314220 is about 315.1958805194.

Adding to 31314220 its reverse (2241313), we get a palindrome (33555533).

The spelling of 31314220 in words is "thirty-one million, three hundred fourteen thousand, two hundred twenty".