20499697 has 2 divisors, whose sum is σ = 20499698. Its totient is φ = 20499696.

The previous prime is 20499679. The next prime is 20499749. The reversal of 20499697 is 79699402.

Together with previous prime (20499679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19280881 + 1218816 = 4391^2 + 1104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20499697 - 2¹¹ = 20497649 is a prime.

It is not a weakly prime, because it can be changed into another prime (20499397) 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, 10249848 + 10249849.

It is an arithmetic number, because the mean of its divisors is an integer number (10249849).

Almost surely, 2^20499697 is an apocalyptic number.

It is an amenable number.

20499697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20499697 is an equidigital number, since it uses as much as digits as its factorization.

20499697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 20499697 is about 4527.6591081927. The cubic root of 20499697 is about 273.6838353331.

The spelling of 20499697 in words is "twenty million, four hundred ninety-nine thousand, six hundred ninety-seven".