20570217 has 16 divisors (see below), whose sum is σ = 28968000. Its totient is φ = 12947904.

The previous prime is 20570197. The next prime is 20570227. The reversal of 20570217 is 71207502.

It is not a de Polignac number, because 20570217 - 2⁷ = 20570089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20570227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28659 + ... + 29367.

It is an arithmetic number, because the mean of its divisors is an integer number (1810500).

Almost surely, 2^20570217 is an apocalyptic number.

It is an amenable number.

20570217 is a deficient number, since it is larger than the sum of its proper divisors (8397783).

20570217 is a wasteful number, since it uses less digits than its factorization.

20570217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20570217 is about 4535.4401109484. The cubic root of 20570217 is about 273.9973049267.

Adding to 20570217 its reverse (71207502), we get a palindrome (91777719).

The spelling of 20570217 in words is "twenty million, five hundred seventy thousand, two hundred seventeen".