20149271 has 2 divisors, whose sum is σ = 20149272. Its totient is φ = 20149270.

The previous prime is 20149243. The next prime is 20149309. The reversal of 20149271 is 17294102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20149271 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20149271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20149211) 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, 10074635 + 10074636.

It is an arithmetic number, because the mean of its divisors is an integer number (10074636).

Almost surely, 2^20149271 is an apocalyptic number.

20149271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149271 is an equidigital number, since it uses as much as digits as its factorization.

20149271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20149271 is about 4488.7939360144. The cubic root of 20149271 is about 272.1153949170.

The spelling of 20149271 in words is "twenty million, one hundred forty-nine thousand, two hundred seventy-one".