20530207 has 4 divisors (see below), whose sum is σ = 20836696. Its totient is φ = 20223720.

The previous prime is 20530201. The next prime is 20530219. The reversal of 20530207 is 70203502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70203502 = 2 ⋅35101751.

It is a cyclic number.

It is not a de Polignac number, because 20530207 - 2¹⁹ = 20005919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530201) 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, 153144 + ... + 153277.

It is an arithmetic number, because the mean of its divisors is an integer number (5209174).

Almost surely, 2^20530207 is an apocalyptic number.

20530207 is a deficient number, since it is larger than the sum of its proper divisors (306489).

20530207 is an equidigital number, since it uses as much as digits as its factorization.

20530207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306488.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20530207 is about 4531.0271462440. The cubic root of 20530207 is about 273.8195439197.

Adding to 20530207 its reverse (70203502), we get a palindrome (90733709).

The spelling of 20530207 in words is "twenty million, five hundred thirty thousand, two hundred seven".