31243302420 has 96 divisors (see below), whose sum is σ = 95573592576. Its totient is φ = 7563062400.

The previous prime is 31243302413. The next prime is 31243302427. The reversal of 31243302420 is 2420334213.

It is an interprime number because it is at equal distance from previous prime (31243302413) and next prime (31243302427).

It is a super-2 number, since 2×31243302420² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31243302427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421807 + ... + 490313.

It is an arithmetic number, because the mean of its divisors is an integer number (995558256).

Almost surely, 2^31243302420 is an apocalyptic number.

31243302420 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 31243302420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47786796288).

31243302420 is an abundant number, since it is smaller than the sum of its proper divisors (64330290156).

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

31243302420 is a wasteful number, since it uses less digits than its factorization.

31243302420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69221 (or 69219 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 31243302420 its reverse (2420334213), we get a palindrome (33663636633).

The spelling of 31243302420 in words is "thirty-one billion, two hundred forty-three million, three hundred two thousand, four hundred twenty".