20001201612 has 144 divisors (see below), whose sum is σ = 56260915200. Its totient is φ = 5508518400.

The previous prime is 20001201551. The next prime is 20001201707. The reversal of 20001201612 is 21610210002.

20001201612 is an astonishing number since 20001201612 = 1612 + ... + 200012.

It is a junction number, because it is equal to n+sod(n) for n = 20001201591 and 20001201600.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4937764 + ... + 4941812.

It is an arithmetic number, because the mean of its divisors is an integer number (390700800).

Almost surely, 2^20001201612 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 20001201612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28130457600).

20001201612 is an abundant number, since it is smaller than the sum of its proper divisors (36259713588).

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

20001201612 is a wasteful number, since it uses less digits than its factorization.

20001201612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372 (or 4363 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20001201612 its reverse (21610210002), we get a palindrome (41611411614).

The spelling of 20001201612 in words is "twenty billion, one million, two hundred one thousand, six hundred twelve".