20188045 has 4 divisors (see below), whose sum is σ = 24225660. Its totient is φ = 16150432.

The previous prime is 20188033. The next prime is 20188057. The reversal of 20188045 is 54088102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20188033) and next prime (20188057).

It can be written as a sum of positive squares in 2 ways, for example, as 14791716 + 5396329 = 3846^2 + 2323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20188045 - 2⁷ = 20187917 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018800 + ... + 2018809.

It is an arithmetic number, because the mean of its divisors is an integer number (6056415).

Almost surely, 2^20188045 is an apocalyptic number.

It is an amenable number.

20188045 is a deficient number, since it is larger than the sum of its proper divisors (4037615).

20188045 is an equidigital number, since it uses as much as digits as its factorization.

20188045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037614.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 20188045 is about 4493.1108377159. The cubic root of 20188045 is about 272.2898303701.

The spelling of 20188045 in words is "twenty million, one hundred eighty-eight thousand, forty-five".