20197159 has 2 divisors, whose sum is σ = 20197160. Its totient is φ = 20197158.

The previous prime is 20197141. The next prime is 20197183. The reversal of 20197159 is 95179102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20197159 - 2⁵ = 20197127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20197109) 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, 10098579 + 10098580.

It is an arithmetic number, because the mean of its divisors is an integer number (10098580).

Almost surely, 2^20197159 is an apocalyptic number.

20197159 is a deficient number, since it is larger than the sum of its proper divisors (1).

20197159 is an equidigital number, since it uses as much as digits as its factorization.

20197159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 20197159 is about 4494.1249426334. The cubic root of 20197159 is about 272.3307997682.

It can be divided in two parts, 2019715 and 9, that multiplied together give a triangular number (18177435 = T₆₀₂₉).

The spelling of 20197159 in words is "twenty million, one hundred ninety-seven thousand, one hundred fifty-nine".