31033402420 has 48 divisors (see below), whose sum is σ = 69018808320. Its totient is φ = 11680602624.

The previous prime is 31033402409. The next prime is 31033402423. The reversal of 31033402420 is 2420433013.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31033402391 and 31033402400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033402423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2386777 + ... + 2399743.

It is an arithmetic number, because the mean of its divisors is an integer number (1437891840).

Almost surely, 2^31033402420 is an apocalyptic number.

It is an amenable number.

31033402420 is an abundant number, since it is smaller than the sum of its proper divisors (37985405900).

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

31033402420 is a wasteful number, since it uses less digits than its factorization.

31033402420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20032 (or 20030 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 31033402420 its reverse (2420433013), we get a palindrome (33453835433).

The spelling of 31033402420 in words is "thirty-one billion, thirty-three million, four hundred two thousand, four hundred twenty".