20312312140 has 48 divisors (see below), whose sum is σ = 44937900000. Its totient is φ = 7690954752.

The previous prime is 20312312117. The next prime is 20312312149. The reversal of 20312312140 is 4121321302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20312312149) 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, 453222 + ... + 496018.

It is an arithmetic number, because the mean of its divisors is an integer number (936206250).

Almost surely, 2^20312312140 is an apocalyptic number.

20312312140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312312140 is an abundant number, since it is smaller than the sum of its proper divisors (24625587860).

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

20312312140 is a wasteful number, since it uses less digits than its factorization.

20312312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44074 (or 44072 counting only the distinct ones).

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

Adding to 20312312140 its reverse (4121321302), we get a palindrome (24433633442).

The spelling of 20312312140 in words is "twenty billion, three hundred twelve million, three hundred twelve thousand, one hundred forty".