20100020009999 has 32 divisors (see below), whose sum is σ = 20633507758080. Its totient is φ = 19575359970048.

The previous prime is 20100020009977. The next prime is 20100020010061. The reversal of 20100020009999 is 99990002000102.

It is a cyclic number.

It is not a de Polignac number, because 20100020009999 - 2¹² = 20100020005903 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 (20100020009969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1950884882 + ... + 1950895184.

It is an arithmetic number, because the mean of its divisors is an integer number (644797117440).

Almost surely, 2^{20100020009999} is an apocalyptic number.

20100020009999 is a deficient number, since it is larger than the sum of its proper divisors (533487748081).

20100020009999 is a wasteful number, since it uses less digits than its factorization.

20100020009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591.

The product of its (nonzero) digits is 26244, while the sum is 41.

The spelling of 20100020009999 in words is "twenty trillion, one hundred billion, twenty million, nine thousand, nine hundred ninety-nine".