20616266 has 16 divisors (see below), whose sum is σ = 33808320. Its totient is φ = 9350880.

The previous prime is 20616263. The next prime is 20616269. The reversal of 20616266 is 66261602.

It is an interprime number because it is at equal distance from previous prime (20616263) and next prime (20616269).

It is not an unprimeable number, because it can be changed into a prime (20616263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15350 + ... + 16638.

It is an arithmetic number, because the mean of its divisors is an integer number (2113020).

Almost surely, 2^20616266 is an apocalyptic number.

20616266 is a deficient number, since it is larger than the sum of its proper divisors (13192054).

20616266 is a wasteful number, since it uses less digits than its factorization.

20616266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20616266 is about 4540.5138475728. The cubic root of 20616266 is about 274.2016116103.

Adding to 20616266 its reverse (66261602), we get a palindrome (86877868).

The spelling of 20616266 in words is "twenty million, six hundred sixteen thousand, two hundred sixty-six".