31720052 has 72 divisors (see below), whose sum is σ = 71053920. Its totient is φ = 12277440.

The previous prime is 31720049. The next prime is 31720103. The reversal of 31720052 is 25002713.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150227 + ... + 150437.

It is an arithmetic number, because the mean of its divisors is an integer number (986860).

Almost surely, 2^31720052 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 31720052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35526960).

31720052 is an abundant number, since it is smaller than the sum of its proper divisors (39333868).

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

31720052 is a wasteful number, since it uses less digits than its factorization.

31720052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 31720052 is about 5632.0557525650. The cubic root of 31720052 is about 316.5516854331.

Adding to 31720052 its reverse (25002713), we get a palindrome (56722765).

The spelling of 31720052 in words is "thirty-one million, seven hundred twenty thousand, fifty-two".