20065128867 has 128 divisors (see below), whose sum is σ = 35804160000. Its totient is φ = 10868981760.

The previous prime is 20065128841. The next prime is 20065128871. The reversal of 20065128867 is 76882156002.

It is not a de Polignac number, because 20065128867 - 2¹⁵ = 20065096099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20065128827) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 44688259 + ... + 44688707.

It is an arithmetic number, because the mean of its divisors is an integer number (279720000).

Almost surely, 2^20065128867 is an apocalyptic number.

20065128867 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20065128867 is a deficient number, since it is larger than the sum of its proper divisors (15739031133).

20065128867 is a wasteful number, since it uses less digits than its factorization.

20065128867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 20065128867 in words is "twenty billion, sixty-five million, one hundred twenty-eight thousand, eight hundred sixty-seven".