20351143 has 2 divisors, whose sum is σ = 20351144. Its totient is φ = 20351142.

The previous prime is 20351131. The next prime is 20351153. The reversal of 20351143 is 34115302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20351143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20351143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20351153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175571 + 10175572.

It is an arithmetic number, because the mean of its divisors is an integer number (10175572).

Almost surely, 2^20351143 is an apocalyptic number.

20351143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351143 is an equidigital number, since it uses as much as digits as its factorization.

20351143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20351143 is about 4511.2241132535. The cubic root of 20351143 is about 273.0211355496.

Adding to 20351143 its reverse (34115302), we get a palindrome (54466445).

The spelling of 20351143 in words is "twenty million, three hundred fifty-one thousand, one hundred forty-three".