20774591 has 2 divisors, whose sum is σ = 20774592. Its totient is φ = 20774590.

The previous prime is 20774573. The next prime is 20774603. The reversal of 20774591 is 19547702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20774591 - 2¹⁸ = 20512447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20774521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387295 + 10387296.

It is an arithmetic number, because the mean of its divisors is an integer number (10387296).

Almost surely, 2^20774591 is an apocalyptic number.

20774591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20774591 is an equidigital number, since it uses as much as digits as its factorization.

20774591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20774591 is about 4557.9152032481. The cubic root of 20774591 is about 274.9017434098.

The spelling of 20774591 in words is "twenty million, seven hundred seventy-four thousand, five hundred ninety-one".