20915896092099 has 64 divisors (see below), whose sum is σ = 31239497318400. Its totient is φ = 12379385221632.

The previous prime is 20915896092097. The next prime is 20915896092103. The reversal of 20915896092099 is 99029069851902.

It is a Cunningham number, because it is equal to 4573390²-1.

It is not a de Polignac number, because 20915896092099 - 2¹ = 20915896092097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is not an unprimeable number, because it can be changed into a prime (20915896092097) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77613102 + ... + 77882124.

It is an arithmetic number, because the mean of its divisors is an integer number (488117145600).

Almost surely, 2^{20915896092099} is an apocalyptic number.

20915896092099 is a deficient number, since it is larger than the sum of its proper divisors (10323601226301).

20915896092099 is a wasteful number, since it uses less digits than its factorization.

20915896092099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269984.

The product of its (nonzero) digits is 56687040, while the sum is 69.

The spelling of 20915896092099 in words is "twenty trillion, nine hundred fifteen billion, eight hundred ninety-six million, ninety-two thousand, ninety-nine".