20378143 has 2 divisors, whose sum is σ = 20378144. Its totient is φ = 20378142.

The previous prime is 20378131. The next prime is 20378147. The reversal of 20378143 is 34187302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20378143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20378147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189071 + 10189072.

It is an arithmetic number, because the mean of its divisors is an integer number (10189072).

Almost surely, 2^20378143 is an apocalyptic number.

20378143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378143 is an equidigital number, since it uses as much as digits as its factorization.

20378143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20378143 is about 4514.2156572322. The cubic root of 20378143 is about 273.1418218601.

The spelling of 20378143 in words is "twenty million, three hundred seventy-eight thousand, one hundred forty-three".