20001201011992 has 16 divisors (see below), whose sum is σ = 39132784589040. Its totient is φ = 9565791788256.

The previous prime is 20001201011989. The next prime is 20001201011993. The reversal of 20001201011992 is 29911010210002.

It is a self number, because there is not a number n which added to its sum of digits gives 20001201011992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201011993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54351089523 + ... + 54351089890.

It is an arithmetic number, because the mean of its divisors is an integer number (2445799036815).

Almost surely, 2^{20001201011992} is an apocalyptic number.

It is an amenable number.

20001201011992 is a deficient number, since it is larger than the sum of its proper divisors (19131583577048).

20001201011992 is a wasteful number, since it uses less digits than its factorization.

20001201011992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108702179442 (or 108702179438 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

Adding to 20001201011992 its reverse (29911010210002), we get a palindrome (49912211221994).

The spelling of 20001201011992 in words is "twenty trillion, one billion, two hundred one million, eleven thousand, nine hundred ninety-two".