31364220 has 24 divisors (see below), whose sum is σ = 87819984. Its totient is φ = 8363776.

The previous prime is 31364189. The next prime is 31364227. The reversal of 31364220 is 2246313.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31364227) 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, 261309 + ... + 261428.

It is an arithmetic number, because the mean of its divisors is an integer number (3659166).

Almost surely, 2^31364220 is an apocalyptic number.

31364220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31364220 is an abundant number, since it is smaller than the sum of its proper divisors (56455764).

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

31364220 is a wasteful number, since it uses less digits than its factorization.

31364220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522749 (or 522747 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 31364220 is about 5600.3767730395. The cubic root of 31364220 is about 315.3635510268.

The spelling of 31364220 in words is "thirty-one million, three hundred sixty-four thousand, two hundred twenty".