20530217 has 8 divisors (see below), whose sum is σ = 21115080. Its totient is φ = 19949440.

The previous prime is 20530201. The next prime is 20530219. The reversal of 20530217 is 71203502.

It can be written as a sum of positive squares in 4 ways, for example, as 958441 + 19571776 = 979^2 + 4424^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20530217 - 2⁴ = 20530201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20530219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11159 + ... + 12867.

It is an arithmetic number, because the mean of its divisors is an integer number (2639385).

Almost surely, 2^20530217 is an apocalyptic number.

It is an amenable number.

20530217 is a deficient number, since it is larger than the sum of its proper divisors (584863).

20530217 is a wasteful number, since it uses less digits than its factorization.

20530217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20530217 is about 4531.0282497464. The cubic root of 20530217 is about 273.8195883777.

Adding to 20530217 its reverse (71203502), we get a palindrome (91733719).

The spelling of 20530217 in words is "twenty million, five hundred thirty thousand, two hundred seventeen".