20051497 has 2 divisors, whose sum is σ = 20051498. Its totient is φ = 20051496.

The previous prime is 20051477. The next prime is 20051503. The reversal of 20051497 is 79415002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 2903616 = 4141^2 + 1704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20051497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20051407) 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, 10025748 + 10025749.

It is an arithmetic number, because the mean of its divisors is an integer number (10025749).

Almost surely, 2^20051497 is an apocalyptic number.

It is an amenable number.

20051497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051497 is an equidigital number, since it uses as much as digits as its factorization.

20051497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20051497 is about 4477.8897931950. The cubic root of 20051497 is about 271.6745359274.

Adding to 20051497 its reverse (79415002), we get a palindrome (99466499).

The spelling of 20051497 in words is "twenty million, fifty-one thousand, four hundred ninety-seven".