20050506 has 72 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 5651856.

The previous prime is 20050493. The next prime is 20050507. The reversal of 20050506 is 60505002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20050507) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111925 + ... + 112103.

It is an arithmetic number, because the mean of its divisors is an integer number (711360).

Almost surely, 2^20050506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20050506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25608960).

20050506 is an abundant number, since it is smaller than the sum of its proper divisors (31167414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20050506 is a wasteful number, since it uses less digits than its factorization.

20050506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20050506 is about 4477.7791370276. The cubic root of 20050506 is about 271.6700602200.

Adding to 20050506 its reverse (60505002), we get a palindrome (80555508).

It can be divided in two parts, 2005050 and 6, that added together give a square (2005056 = 1416²).

The spelling of 20050506 in words is "twenty million, fifty thousand, five hundred six".