31030420 has 48 divisors (see below), whose sum is σ = 70479360. Its totient is φ = 11435904.

The previous prime is 31030409. The next prime is 31030429. The reversal of 31030420 is 2403013.

It is a self number, because there is not a number n which added to its sum of digits gives 31030420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12957 + ... + 15163.

It is an arithmetic number, because the mean of its divisors is an integer number (1468320).

Almost surely, 2^31030420 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 31030420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35239680).

31030420 is an abundant number, since it is smaller than the sum of its proper divisors (39448940).

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

31030420 is a wasteful number, since it uses less digits than its factorization.

31030420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272 (or 2270 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 31030420 is about 5570.4954896311. The cubic root of 31030420 is about 314.2407851949.

Adding to 31030420 its reverse (2403013), we get a palindrome (33433433).

The spelling of 31030420 in words is "thirty-one million, thirty thousand, four hundred twenty".