20948143 has 2 divisors, whose sum is σ = 20948144. Its totient is φ = 20948142.

The previous prime is 20948129. The next prime is 20948149. The reversal of 20948143 is 34184902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20948143 - 2⁹ = 20947631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20948149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474071 + 10474072.

It is an arithmetic number, because the mean of its divisors is an integer number (10474072).

Almost surely, 2^20948143 is an apocalyptic number.

20948143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948143 is an equidigital number, since it uses as much as digits as its factorization.

20948143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20948143 is about 4576.9141350915. The cubic root of 20948143 is about 275.6651359600.

The spelling of 20948143 in words is "twenty million, nine hundred forty-eight thousand, one hundred forty-three".