20001243412 has 6 divisors (see below), whose sum is σ = 35002175978. Its totient is φ = 10000621704.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243412 is 21434210002.

It can be written as a sum of positive squares in only one way, i.e., 19882128016 + 119115396 = 141004^2 + 10914^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20001243412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500155423 + ... + 2500155430.

Almost surely, 2^20001243412 is an apocalyptic number.

It is an amenable number.

20001243412 is a deficient number, since it is larger than the sum of its proper divisors (15000932566).

20001243412 is a wasteful number, since it uses less digits than its factorization.

20001243412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000310857 (or 5000310855 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20001243412 its reverse (21434210002), we get a palindrome (41435453414).

The spelling of 20001243412 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred twelve".