31204220 has 12 divisors (see below), whose sum is σ = 65528904. Its totient is φ = 12481680.

The previous prime is 31204211. The next prime is 31204237. The reversal of 31204220 is 2240213.

It is a junction number, because it is equal to n+sod(n) for n = 31204195 and 31204204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780086 + ... + 780125.

It is an arithmetic number, because the mean of its divisors is an integer number (5460742).

Almost surely, 2^31204220 is an apocalyptic number.

It is an amenable number.

31204220 is an abundant number, since it is smaller than the sum of its proper divisors (34324684).

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

31204220 is a wasteful number, since it uses less digits than its factorization.

31204220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560220 (or 1560218 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31204220 is about 5586.0737553312. The cubic root of 31204220 is about 314.8263761417.

Adding to 31204220 its reverse (2240213), we get a palindrome (33444433).

The spelling of 31204220 in words is "thirty-one million, two hundred four thousand, two hundred twenty".