20516803 has 2 divisors, whose sum is σ = 20516804. Its totient is φ = 20516802.

The previous prime is 20516791. The next prime is 20516831. The reversal of 20516803 is 30861502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20516803 - 2¹³ = 20508611 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516843) 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, 10258401 + 10258402.

It is an arithmetic number, because the mean of its divisors is an integer number (10258402).

Almost surely, 2^20516803 is an apocalyptic number.

20516803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516803 is an equidigital number, since it uses as much as digits as its factorization.

20516803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20516803 is about 4529.5477699214. The cubic root of 20516803 is about 273.7599394513.

The spelling of 20516803 in words is "twenty million, five hundred sixteen thousand, eight hundred three".