20516307 has 16 divisors (see below), whose sum is σ = 31553280. Its totient is φ = 11614752.

The previous prime is 20516281. The next prime is 20516323. The reversal of 20516307 is 70361502.

It is not a de Polignac number, because 20516307 - 2¹⁰ = 20515283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20516357) 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 in 15 ways as a sum of consecutive naturals, for example, 2193 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (1972080).

Almost surely, 2^20516307 is an apocalyptic number.

20516307 is a deficient number, since it is larger than the sum of its proper divisors (11036973).

20516307 is a wasteful number, since it uses less digits than its factorization.

20516307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9082.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20516307 is about 4529.4930179878. The cubic root of 20516307 is about 273.7577333567.

Adding to 20516307 its reverse (70361502), we get a palindrome (90877809).

The spelling of 20516307 in words is "twenty million, five hundred sixteen thousand, three hundred seven".