20188673 has 6 divisors (see below), whose sum is σ = 21446406. Its totient is φ = 19000832.

The previous prime is 20188667. The next prime is 20188703. The reversal of 20188673 is 37688102.

It can be written as a sum of positive squares in 3 ways, for example, as 6697744 + 13490929 = 2588^2 + 3673^2 .

It is not a de Polignac number, because 20188673 - 2²⁰ = 19140097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20188613) 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, 34640 + ... + 35217.

It is an arithmetic number, because the mean of its divisors is an integer number (3574401).

Almost surely, 2^20188673 is an apocalyptic number.

It is an amenable number.

20188673 is a deficient number, since it is larger than the sum of its proper divisors (1257733).

20188673 is an equidigital number, since it uses as much as digits as its factorization.

20188673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69891 (or 69874 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20188673 is about 4493.1807219385. The cubic root of 20188673 is about 272.2926537612.

The spelling of 20188673 in words is "twenty million, one hundred eighty-eight thousand, six hundred seventy-three".