31100420 has 24 divisors (see below), whose sum is σ = 70335384. Its totient is φ = 11483136.

The previous prime is 31100411. The next prime is 31100449. The reversal of 31100420 is 2400113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 806404 + 30294016 = 898^2 + 5504^2 .

It is a super-2 number, since 2×31100420² = 1934472248352800, which contains 22 as substring.

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, 59549 + ... + 60068.

It is an arithmetic number, because the mean of its divisors is an integer number (2930641).

Almost surely, 2^31100420 is an apocalyptic number.

It is an amenable number.

31100420 is an abundant number, since it is smaller than the sum of its proper divisors (39234964).

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

31100420 is a wasteful number, since it uses less digits than its factorization.

31100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119639 (or 119637 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31100420 is about 5576.7750537385. The cubic root of 31100420 is about 314.4769011860.

Adding to 31100420 its reverse (2400113), we get a palindrome (33500533).

The spelling of 31100420 in words is "thirty-one million, one hundred thousand, four hundred twenty".