20113212340 has 48 divisors (see below), whose sum is σ = 45566801280. Its totient is φ = 7413356160.

The previous prime is 20113212323. The next prime is 20113212367. The reversal of 20113212340 is 4321231102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 80721 + ... + 216199.

It is an arithmetic number, because the mean of its divisors is an integer number (949308360).

Almost surely, 2^20113212340 is an apocalyptic number.

20113212340 is a gapful number since it is divisible by the number (20) 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 20113212340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22783400640).

20113212340 is an abundant number, since it is smaller than the sum of its proper divisors (25453588940).

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

20113212340 is a wasteful number, since it uses less digits than its factorization.

20113212340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136072 (or 136070 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20113212340 its reverse (4321231102), we get a palindrome (24434443442).

The spelling of 20113212340 in words is "twenty billion, one hundred thirteen million, two hundred twelve thousand, three hundred forty".