20018001999 has 16 divisors (see below), whose sum is σ = 28811520000. Its totient is φ = 12324925536.

The previous prime is 20018001977. The next prime is 20018002021. The reversal of 20018001999 is 99910081002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20018001977) and next prime (20018002021).

It is not a de Polignac number, because 20018001999 - 2⁵ = 20018001967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018001599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4999999 + ... + 5004000.

It is an arithmetic number, because the mean of its divisors is an integer number (1800720000).

Almost surely, 2^20018001999 is an apocalyptic number.

20018001999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20018001999 is a deficient number, since it is larger than the sum of its proper divisors (8793518001).

20018001999 is a wasteful number, since it uses less digits than its factorization.

20018001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10004054.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 20018001999 in words is "twenty billion, eighteen million, one thousand, nine hundred ninety-nine".