20169988667 has 6 divisors (see below), whose sum is σ = 21085073772. Its totient is φ = 19293032132.

The previous prime is 20169988651. The next prime is 20169988687. The reversal of 20169988667 is 76688996102.

It is not a de Polignac number, because 20169988667 - 2⁴ = 20169988651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20169988687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19063733 + ... + 19064790.

It is an arithmetic number, because the mean of its divisors is an integer number (3514178962).

Almost surely, 2^20169988667 is an apocalyptic number.

20169988667 is a deficient number, since it is larger than the sum of its proper divisors (915085105).

20169988667 is an equidigital number, since it uses as much as digits as its factorization.

20169988667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38128569 (or 38128546 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 20169988667 in words is "twenty billion, one hundred sixty-nine million, nine hundred eighty-eight thousand, six hundred sixty-seven".