31042420 has 12 divisors (see below), whose sum is σ = 65189124. Its totient is φ = 12416960.

The previous prime is 31042397. The next prime is 31042421. The reversal of 31042420 is 2424013.

It can be written as a sum of positive squares in 2 ways, for example, as 21270544 + 9771876 = 4612^2 + 3126^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31042394 and 31042403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31042421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776041 + ... + 776080.

It is an arithmetic number, because the mean of its divisors is an integer number (5432427).

Almost surely, 2^31042420 is an apocalyptic number.

It is an amenable number.

31042420 is an abundant number, since it is smaller than the sum of its proper divisors (34146704).

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

31042420 is a wasteful number, since it uses less digits than its factorization.

31042420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552130 (or 1552128 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31042420 is about 5571.5724889837. The cubic root of 31042420 is about 314.2812874229.

Adding to 31042420 its reverse (2424013), we get a palindrome (33466433).

The spelling of 31042420 in words is "thirty-one million, forty-two thousand, four hundred twenty".