20108777815 has 16 divisors (see below), whose sum is σ = 27596828160. Its totient is φ = 13779338400.

The previous prime is 20108777803. The next prime is 20108777863. The reversal of 20108777815 is 51877780102.

It is not a de Polignac number, because 20108777815 - 2⁷ = 20108777687 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147195 + ... + 248764.

It is an arithmetic number, because the mean of its divisors is an integer number (1724801760).

Almost surely, 2^20108777815 is an apocalyptic number.

20108777815 is a deficient number, since it is larger than the sum of its proper divisors (7488050345).

20108777815 is a wasteful number, since it uses less digits than its factorization.

20108777815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397422.

The product of its (nonzero) digits is 219520, while the sum is 46.

The spelling of 20108777815 in words is "twenty billion, one hundred eight million, seven hundred seventy-seven thousand, eight hundred fifteen".