20351984975999 has 8 divisors (see below), whose sum is σ = 20359644214272. Its totient is φ = 20344326190200.

The previous prime is 20351984975989. The next prime is 20351984976067. The reversal of 20351984975999 is 99957948915302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20351984975999 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 (20351984975929) 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, 109591274 + ... + 109776824.

It is an arithmetic number, because the mean of its divisors is an integer number (2544955526784).

Almost surely, 2^{20351984975999} is an apocalyptic number.

20351984975999 is a deficient number, since it is larger than the sum of its proper divisors (7659238273).

20351984975999 is a wasteful number, since it uses less digits than its factorization.

20351984975999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226237.

The product of its (nonzero) digits is 1984046400, while the sum is 80.

The spelling of 20351984975999 in words is "twenty trillion, three hundred fifty-one billion, nine hundred eighty-four million, nine hundred seventy-five thousand, nine hundred ninety-nine".