20378045 has 4 divisors (see below), whose sum is σ = 24453660. Its totient is φ = 16302432.

The previous prime is 20378027. The next prime is 20378047. The reversal of 20378045 is 54087302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7150276 + 13227769 = 2674^2 + 3637^2 .

It is a cyclic number.

It is not a de Polignac number, because 20378045 - 2⁸ = 20377789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20377999 and 20378017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037800 + ... + 2037809.

It is an arithmetic number, because the mean of its divisors is an integer number (6113415).

Almost surely, 2^20378045 is an apocalyptic number.

It is an amenable number.

20378045 is a deficient number, since it is larger than the sum of its proper divisors (4075615).

20378045 is an equidigital number, since it uses as much as digits as its factorization.

20378045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075614.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20378045 is about 4514.2048026203. The cubic root of 20378045 is about 273.1413840063.

The spelling of 20378045 in words is "twenty million, three hundred seventy-eight thousand, forty-five".