31742420 has 12 divisors (see below), whose sum is σ = 66659124. Its totient is φ = 12696960.

The previous prime is 31742401. The next prime is 31742441. The reversal of 31742420 is 2424713.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 24245776 = 2738^2 + 4924^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 793541 + ... + 793580.

It is an arithmetic number, because the mean of its divisors is an integer number (5554927).

Almost surely, 2^31742420 is an apocalyptic number.

It is an amenable number.

31742420 is an abundant number, since it is smaller than the sum of its proper divisors (34916704).

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

31742420 is a wasteful number, since it uses less digits than its factorization.

31742420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587130 (or 1587128 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31742420 is about 5634.0411784083. The cubic root of 31742420 is about 316.6260754373.

The spelling of 31742420 in words is "thirty-one million, seven hundred forty-two thousand, four hundred twenty".