20000100009991 has 8 divisors (see below), whose sum is σ = 20681601591024. Its totient is φ = 19329862918080.

The previous prime is 20000100009983. The next prime is 20000100010061. The reversal of 20000100009991 is 19990000100002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20000100009991 - 2³ = 20000100009983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000100009971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2816118670 + ... + 2816125771.

It is an arithmetic number, because the mean of its divisors is an integer number (2585200198878).

Almost surely, 2^{20000100009991} is an apocalyptic number.

20000100009991 is a deficient number, since it is larger than the sum of its proper divisors (681501581033).

20000100009991 is an equidigital number, since it uses as much as digits as its factorization.

20000100009991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632244561.

The product of its (nonzero) digits is 1458, while the sum is 31.

Adding to 20000100009991 its reverse (19990000100002), we get a palindrome (39990100109993).

The spelling of 20000100009991 in words is "twenty trillion, one hundred million, nine thousand, nine hundred ninety-one".