20530507 has 4 divisors (see below), whose sum is σ = 21611080. Its totient is φ = 19449936.

The previous prime is 20530487. The next prime is 20530519. The reversal of 20530507 is 70503502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70503502 = 2 ⋅35251751.

It is a cyclic number.

It is not a de Polignac number, because 20530507 - 2¹⁹ = 20006219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20530567) 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, 540258 + ... + 540295.

It is an arithmetic number, because the mean of its divisors is an integer number (5402770).

Almost surely, 2^20530507 is an apocalyptic number.

20530507 is a deficient number, since it is larger than the sum of its proper divisors (1080573).

20530507 is a wasteful number, since it uses less digits than its factorization.

20530507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080572.

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 20530507 is about 4531.0602511995. The cubic root of 20530507 is about 273.8208776530.

The spelling of 20530507 in words is "twenty million, five hundred thirty thousand, five hundred seven".