20647106 has 4 divisors (see below), whose sum is σ = 30970662. Its totient is φ = 10323552.

The previous prime is 20647093. The next prime is 20647111. The reversal of 20647106 is 60174602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60174602 = 2 ⋅30087301.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 7980625 = 3559^2 + 2825^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5161775 + ... + 5161778.

Almost surely, 2^20647106 is an apocalyptic number.

20647106 is a deficient number, since it is larger than the sum of its proper divisors (10323556).

20647106 is a wasteful number, since it uses less digits than its factorization.

20647106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10323555.

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

The square root of 20647106 is about 4543.9086698568. The cubic root of 20647106 is about 274.3382701199.

The spelling of 20647106 in words is "twenty million, six hundred forty-seven thousand, one hundred six".