31720941 has 24 divisors (see below), whose sum is σ = 52703040. Its totient is φ = 18009216.

The previous prime is 31720939. The next prime is 31720943. The reversal of 31720941 is 14902713.

It is an interprime number because it is at equal distance from previous prime (31720939) and next prime (31720943).

It is not a de Polignac number, because 31720941 - 2¹ = 31720939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31720943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8725 + ... + 11813.

It is an arithmetic number, because the mean of its divisors is an integer number (2195960).

Almost surely, 2^31720941 is an apocalyptic number.

It is an amenable number.

31720941 is a deficient number, since it is larger than the sum of its proper divisors (20982099).

31720941 is a wasteful number, since it uses less digits than its factorization.

31720941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265 (or 3262 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31720941 is about 5632.1346752364. The cubic root of 31720941 is about 316.5546426773.

The spelling of 31720941 in words is "thirty-one million, seven hundred twenty thousand, nine hundred forty-one".