20001440312 has 128 divisors (see below), whose sum is σ = 44891504640. Its totient is φ = 8174960640.

The previous prime is 20001440269. The next prime is 20001440383. The reversal of 20001440312 is 21304410002.

It is a super-2 number, since 2×20001440312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56661128 + ... + 56661480.

It is an arithmetic number, because the mean of its divisors is an integer number (350714880).

Almost surely, 2^20001440312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001440312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22445752320).

20001440312 is an abundant number, since it is smaller than the sum of its proper divisors (24890064328).

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

20001440312 is a wasteful number, since it uses less digits than its factorization.

20001440312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20001440312 its reverse (21304410002), we get a palindrome (41305850314).

The spelling of 20001440312 in words is "twenty billion, one million, four hundred forty thousand, three hundred twelve".