20006947 has 4 divisors (see below), whose sum is σ = 20034760. Its totient is φ = 19979136.

The previous prime is 20006927. The next prime is 20006953. The reversal of 20006947 is 74960002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20006947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20006927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12798 + ... + 14275.

It is an arithmetic number, because the mean of its divisors is an integer number (5008690).

Almost surely, 2^20006947 is an apocalyptic number.

20006947 is a deficient number, since it is larger than the sum of its proper divisors (27813).

20006947 is an equidigital number, since it uses as much as digits as its factorization.

20006947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27812.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20006947 is about 4472.9125857767. The cubic root of 20006947 is about 271.4731864533.

Adding to 20006947 its reverse (74960002), we get a palindrome (94966949).

The spelling of 20006947 in words is "twenty million, six thousand, nine hundred forty-seven".