20216507 has 2 divisors, whose sum is σ = 20216508. Its totient is φ = 20216506.

The previous prime is 20216501. The next prime is 20216569. The reversal of 20216507 is 70561202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20216507 - 2¹⁴ = 20200123 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (20216501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108253 + 10108254.

It is an arithmetic number, because the mean of its divisors is an integer number (10108254).

Almost surely, 2^20216507 is an apocalyptic number.

20216507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216507 is an equidigital number, since it uses as much as digits as its factorization.

20216507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20216507 is about 4496.2770154874. The cubic root of 20216507 is about 272.4177323693.

Adding to 20216507 its reverse (70561202), we get a palindrome (90777709).

The spelling of 20216507 in words is "twenty million, two hundred sixteen thousand, five hundred seven".