20016523 has 2 divisors, whose sum is σ = 20016524. Its totient is φ = 20016522.

The previous prime is 20016499. The next prime is 20016539. The reversal of 20016523 is 32561002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20016523 - 2²¹ = 17919371 is a prime.

It is a super-2 number, since 2×20016523² = 801322386019058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20016523.

It is not a weakly prime, because it can be changed into another prime (20016553) 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, 10008261 + 10008262.

It is an arithmetic number, because the mean of its divisors is an integer number (10008262).

Almost surely, 2^20016523 is an apocalyptic number.

20016523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016523 is an equidigital number, since it uses as much as digits as its factorization.

20016523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20016523 is about 4473.9829011743. The cubic root of 20016523 is about 271.5164916210.

Adding to 20016523 its reverse (32561002), we get a palindrome (52577525).

The spelling of 20016523 in words is "twenty million, sixteen thousand, five hundred twenty-three".