20085491 has 2 divisors, whose sum is σ = 20085492. Its totient is φ = 20085490.

The previous prime is 20085479. The next prime is 20085493. The reversal of 20085491 is 19458002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20085491 - 2¹⁴ = 20069107 is a prime.

It is a super-2 number, since 2×20085491² = 806853897422162, which contains 22 as substring.

Together with 20085493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20085493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042745 + 10042746.

It is an arithmetic number, because the mean of its divisors is an integer number (10042746).

Almost surely, 2^20085491 is an apocalyptic number.

20085491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085491 is an equidigital number, since it uses as much as digits as its factorization.

20085491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20085491 is about 4481.6839469110. The cubic root of 20085491 is about 271.8279756782.

The spelling of 20085491 in words is "twenty million, eighty-five thousand, four hundred ninety-one".