20687068899 has 32 divisors (see below), whose sum is σ = 35071994880. Its totient is φ = 11805566400.

The previous prime is 20687068867. The next prime is 20687068901. The reversal of 20687068899 is 99886078602.

It is a Cunningham number, because it is equal to 143830²-1.

It is not a de Polignac number, because 20687068899 - 2⁵ = 20687068867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20687068399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71914 + ... + 215744.

It is an arithmetic number, because the mean of its divisors is an integer number (1095999840).

Almost surely, 2^20687068899 is an apocalyptic number.

20687068899 is a deficient number, since it is larger than the sum of its proper divisors (14384925981).

20687068899 is a wasteful number, since it uses less digits than its factorization.

20687068899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144608 (or 144602 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 20687068899 in words is "twenty billion, six hundred eighty-seven million, sixty-eight thousand, eight hundred ninety-nine".