12020145140 has 24 divisors (see below), whose sum is σ = 25278343272. Its totient is φ = 4801193600.

The previous prime is 12020145133. The next prime is 12020145157. The reversal of 12020145140 is 4154102021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4085255056 + 7934890084 = 63916^2 + 89078^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414659 + ... + 442698.

It is an arithmetic number, because the mean of its divisors is an integer number (1053264303).

Almost surely, 2^12020145140 is an apocalyptic number.

12020145140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12020145140 is an abundant number, since it is smaller than the sum of its proper divisors (13258198132).

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

12020145140 is a wasteful number, since it uses less digits than its factorization.

12020145140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858067 (or 858065 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 12020145140 its reverse (4154102021), we get a palindrome (16174247161).

The spelling of 12020145140 in words is "twelve billion, twenty million, one hundred forty-five thousand, one hundred forty".