20216626 has 4 divisors (see below), whose sum is σ = 30324942. Its totient is φ = 10108312.

The previous prime is 20216593. The next prime is 20216633. The reversal of 20216626 is 62661202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 900601 = 4395^2 + 949^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20216626.

It is an unprimeable number.

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, 5054155 + ... + 5054158.

Almost surely, 2^20216626 is an apocalyptic number.

20216626 is a deficient number, since it is larger than the sum of its proper divisors (10108316).

20216626 is a wasteful number, since it uses less digits than its factorization.

20216626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108315.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20216626 is about 4496.2902486383. The cubic root of 20216626 is about 272.4182668772.

Adding to 20216626 its reverse (62661202), we get a palindrome (82877828).

The spelling of 20216626 in words is "twenty million, two hundred sixteen thousand, six hundred twenty-six".