20606221 has 8 divisors (see below), whose sum is σ = 20968640. Its totient is φ = 20246112.

The previous prime is 20606219. The next prime is 20606237. The reversal of 20606221 is 12260602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20606221 - 2¹ = 20606219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606921) 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 7 ways as a sum of consecutive naturals, for example, 31726 + ... + 32368.

It is an arithmetic number, because the mean of its divisors is an integer number (2621080).

Almost surely, 2^20606221 is an apocalyptic number.

It is an amenable number.

20606221 is a deficient number, since it is larger than the sum of its proper divisors (362419).

20606221 is an equidigital number, since it uses as much as digits as its factorization.

20606221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20606221 is about 4539.4075604643. The cubic root of 20606221 is about 274.1570706857.

Adding to 20606221 its reverse (12260602), we get a palindrome (32866823).

It can be divided in two parts, 2060 and 6221, that added together give a square (8281 = 91²).

The spelling of 20606221 in words is "twenty million, six hundred six thousand, two hundred twenty-one".