20097491 has 2 divisors, whose sum is σ = 20097492. Its totient is φ = 20097490.

The previous prime is 20097481. The next prime is 20097499. The reversal of 20097491 is 19479002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20097491 - 2¹⁴ = 20081107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20097499) 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, 10048745 + 10048746.

It is an arithmetic number, because the mean of its divisors is an integer number (10048746).

Almost surely, 2^20097491 is an apocalyptic number.

20097491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20097491 is an equidigital number, since it uses as much as digits as its factorization.

20097491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20097491 is about 4483.0225294995. The cubic root of 20097491 is about 271.8820990968.

The spelling of 20097491 in words is "twenty million, ninety-seven thousand, four hundred ninety-one".