31339420 has 72 divisors (see below), whose sum is σ = 77508144. Its totient is φ = 10612224.

The previous prime is 31339403. The next prime is 31339423. The reversal of 31339420 is 2493313.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31339423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110599 + ... + 110881.

It is an arithmetic number, because the mean of its divisors is an integer number (1076502).

Almost surely, 2^31339420 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 31339420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38754072).

31339420 is an abundant number, since it is smaller than the sum of its proper divisors (46168724).

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

31339420 is a wasteful number, since it uses less digits than its factorization.

31339420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 31339420 is about 5598.1621984362. The cubic root of 31339420 is about 315.2804087461.

The spelling of 31339420 in words is "thirty-one million, three hundred thirty-nine thousand, four hundred twenty".