20112506 has 8 divisors (see below), whose sum is σ = 30237300. Its totient is φ = 10033408.

The previous prime is 20112503. The next prime is 20112517. The reversal of 20112506 is 60521102.

It can be written as a sum of positive squares in 2 ways, for example, as 17682025 + 2430481 = 4205^2 + 1559^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20112503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10301 + ... + 12096.

Almost surely, 2^20112506 is an apocalyptic number.

20112506 is a deficient number, since it is larger than the sum of its proper divisors (10124794).

20112506 is a wasteful number, since it uses less digits than its factorization.

20112506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22848.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20112506 is about 4484.6968682398. The cubic root of 20112506 is about 271.9497906890.

Adding to 20112506 its reverse (60521102), we get a palindrome (80633608).

The spelling of 20112506 in words is "twenty million, one hundred twelve thousand, five hundred six".