31011420 has 96 divisors (see below), whose sum is σ = 99751680. Its totient is φ = 7119360.

The previous prime is 31011391. The next prime is 31011437. The reversal of 31011420 is 2411013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31011396 and 31011405.

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 31 ways as a sum of consecutive naturals, for example, 11304 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (1039080).

Almost surely, 2^31011420 is an apocalyptic number.

31011420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31011420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49875840).

31011420 is an abundant number, since it is smaller than the sum of its proper divisors (68740260).

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

31011420 is a wasteful number, since it uses less digits than its factorization.

31011420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515 (or 2513 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31011420 is about 5568.7898146725. The cubic root of 31011420 is about 314.1766353066.

Adding to 31011420 its reverse (2411013), we get a palindrome (33422433).

The spelling of 31011420 in words is "thirty-one million, eleven thousand, four hundred twenty".