20216606 has 4 divisors (see below), whose sum is σ = 30324912. Its totient is φ = 10108302.

The previous prime is 20216593. The next prime is 20216633. The reversal of 20216606 is 60661202.

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

It is a super-2 number, since 2×20216606² = 817422316318472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5054150 + ... + 5054153.

It is an arithmetic number, because the mean of its divisors is an integer number (7581228).

Almost surely, 2^20216606 is an apocalyptic number.

20216606 is a deficient number, since it is larger than the sum of its proper divisors (10108306).

20216606 is a wasteful number, since it uses less digits than its factorization.

20216606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10108305.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20216606 is about 4496.2880245821. The cubic root of 20216606 is about 272.4181770441.

Adding to 20216606 its reverse (60661202), we get a palindrome (80877808).

The spelling of 20216606 in words is "twenty million, two hundred sixteen thousand, six hundred six".