20815705935199 has 16 divisors (see below), whose sum is σ = 23824251925056. Its totient is φ = 17815889145600.

The previous prime is 20815705935191. The next prime is 20815705935257. The reversal of 20815705935199 is 99153950751802.

It is a happy number.

It is not a de Polignac number, because 20815705935199 - 2³ = 20815705935191 is a prime.

It is a super-2 number, since 2×20815705935199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20815705935199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815705935191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22869189 + ... + 23761969.

It is an arithmetic number, because the mean of its divisors is an integer number (1489015745316).

Almost surely, 2^{20815705935199} is an apocalyptic number.

20815705935199 is a deficient number, since it is larger than the sum of its proper divisors (3008545989857).

20815705935199 is an equidigital number, since it uses as much as digits as its factorization.

20815705935199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897666.

The product of its (nonzero) digits is 30618000, while the sum is 64.

The spelling of 20815705935199 in words is "twenty trillion, eight hundred fifteen billion, seven hundred five million, nine hundred thirty-five thousand, one hundred ninety-nine".