20490097 has 2 divisors, whose sum is σ = 20490098. Its totient is φ = 20490096.

The previous prime is 20490091. The next prime is 20490109. The reversal of 20490097 is 79009402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 1515361 = 4356^2 + 1231^2 .

It is a cyclic number.

It is not a de Polignac number, because 20490097 - 2⁷ = 20489969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20490091) 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, 10245048 + 10245049.

It is an arithmetic number, because the mean of its divisors is an integer number (10245049).

Almost surely, 2^20490097 is an apocalyptic number.

It is an amenable number.

20490097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490097 is an equidigital number, since it uses as much as digits as its factorization.

20490097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20490097 is about 4526.5988335615. The cubic root of 20490097 is about 273.6411066518.

Adding to 20490097 its reverse (79009402), we get a palindrome (99499499).

The spelling of 20490097 in words is "twenty million, four hundred ninety thousand, ninety-seven".