20850491 has 2 divisors, whose sum is σ = 20850492. Its totient is φ = 20850490.

The previous prime is 20850463. The next prime is 20850521. The reversal of 20850491 is 19405802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20850491 - 2¹⁰ = 20849467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20850461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10425245 + 10425246.

It is an arithmetic number, because the mean of its divisors is an integer number (10425246).

Almost surely, 2^20850491 is an apocalyptic number.

20850491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20850491 is an equidigital number, since it uses as much as digits as its factorization.

20850491 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 20850491 is about 4566.2337872693. The cubic root of 20850491 is about 275.2361211700.

The spelling of 20850491 in words is "twenty million, eight hundred fifty thousand, four hundred ninety-one".