20606147 has 4 divisors (see below), whose sum is σ = 20673576. Its totient is φ = 20538720.

The previous prime is 20606143. The next prime is 20606171. The reversal of 20606147 is 74160602.

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

It is a cyclic number.

It is not a de Polignac number, because 20606147 - 2² = 20606143 is a prime.

It is a super-2 number, since 2×20606147² = 849226588371218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606141) 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 3 ways as a sum of consecutive naturals, for example, 33254 + ... + 33867.

It is an arithmetic number, because the mean of its divisors is an integer number (5168394).

Almost surely, 2^20606147 is an apocalyptic number.

20606147 is a deficient number, since it is larger than the sum of its proper divisors (67429).

20606147 is an equidigital number, since it uses as much as digits as its factorization.

20606147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67428.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20606147 is about 4539.3994096136. The cubic root of 20606147 is about 274.1567425057.

Adding to 20606147 its reverse (74160602), we get a palindrome (94766749).

The spelling of 20606147 in words is "twenty million, six hundred six thousand, one hundred forty-seven".