20170947 has 6 divisors (see below), whose sum is σ = 26904972. Its totient is φ = 13442112.

The previous prime is 20170933. The next prime is 20170949. The reversal of 20170947 is 74907102.

It is not a de Polignac number, because 20170947 - 2¹⁰ = 20169923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20170949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6483 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (4484162).

Almost surely, 2^20170947 is an apocalyptic number.

20170947 is a deficient number, since it is larger than the sum of its proper divisors (6734025).

20170947 is an frugal number, since it uses more digits than its factorization.

20170947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189 (or 2596 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20170947 is about 4491.2077440261. The cubic root of 20170947 is about 272.2129378912.

The spelling of 20170947 in words is "twenty million, one hundred seventy thousand, nine hundred forty-seven".