31020042 has 16 divisors (see below), whose sum is σ = 62914752. Its totient is φ = 10194240.

The previous prime is 31020007. The next prime is 31020079. The reversal of 31020042 is 24002013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35983 + ... + 36834.

It is an arithmetic number, because the mean of its divisors is an integer number (3932172).

Almost surely, 2^31020042 is an apocalyptic number.

31020042 is an abundant number, since it is smaller than the sum of its proper divisors (31894710).

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

31020042 is a wasteful number, since it uses less digits than its factorization.

31020042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72893.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 31020042 is about 5569.5638967517. The cubic root of 31020042 is about 314.2057490970.

Adding to 31020042 its reverse (24002013), we get a palindrome (55022055).

The spelling of 31020042 in words is "thirty-one million, twenty thousand, forty-two".