20647706 has 8 divisors (see below), whose sum is σ = 30993300. Its totient is φ = 10316608.

The previous prime is 20647703. The next prime is 20647727. The reversal of 20647706 is 60774602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18412681 + 2235025 = 4291^2 + 1495^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20647703) 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, 1250 + ... + 6546.

Almost surely, 2^20647706 is an apocalyptic number.

20647706 is a deficient number, since it is larger than the sum of its proper divisors (10345594).

20647706 is a wasteful number, since it uses less digits than its factorization.

20647706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20647706 is about 4543.9746918309. The cubic root of 20647706 is about 274.3409274958.

The spelling of 20647706 in words is "twenty million, six hundred forty-seven thousand, seven hundred six".