20000506 has 4 divisors (see below), whose sum is σ = 30000762. Its totient is φ = 10000252.

The previous prime is 20000503. The next prime is 20000507. The reversal of 20000506 is 60500002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60500002 = 2 ⋅30250001.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 1121481 = 4345^2 + 1059^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20000503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000125 + ... + 5000128.

Almost surely, 2^20000506 is an apocalyptic number.

20000506 is a deficient number, since it is larger than the sum of its proper divisors (10000256).

20000506 is a wasteful number, since it uses less digits than its factorization.

20000506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000255.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20000506 is about 4472.1925271616. The cubic root of 20000506 is about 271.4440507990. Note that the first 3 decimals are identical.

Adding to 20000506 its reverse (60500002), we get a palindrome (80500508).

The spelling of 20000506 in words is "twenty million, five hundred six", and thus it is an aban number.