20206493 has 2 divisors, whose sum is σ = 20206494. Its totient is φ = 20206492.

The previous prime is 20206453. The next prime is 20206577. The reversal of 20206493 is 39460202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19035769 + 1170724 = 4363^2 + 1082^2 .

It is a cyclic number.

It is not a de Polignac number, because 20206493 - 2²⁰ = 19157917 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 (20206453) 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, 10103246 + 10103247.

It is an arithmetic number, because the mean of its divisors is an integer number (10103247).

Almost surely, 2^20206493 is an apocalyptic number.

It is an amenable number.

20206493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20206493 is an equidigital number, since it uses as much as digits as its factorization.

20206493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20206493 is about 4495.1632895814. The cubic root of 20206493 is about 272.3727453409.

Adding to 20206493 its reverse (39460202), we get a palindrome (59666695).

The spelling of 20206493 in words is "twenty million, two hundred six thousand, four hundred ninety-three".