20378147 has 2 divisors, whose sum is σ = 20378148. Its totient is φ = 20378146.

The previous prime is 20378143. The next prime is 20378153. The reversal of 20378147 is 74187302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20378147 - 2² = 20378143 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20378143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189073 + 10189074.

It is an arithmetic number, because the mean of its divisors is an integer number (10189074).

Almost surely, 2^20378147 is an apocalyptic number.

20378147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378147 is an equidigital number, since it uses as much as digits as its factorization.

20378147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20378147 is about 4514.2161002770. The cubic root of 20378147 is about 273.1418397317.

The spelling of 20378147 in words is "twenty million, three hundred seventy-eight thousand, one hundred forty-seven".