20405050 has 48 divisors (see below), whose sum is σ = 40890240. Its totient is φ = 7551360.

The previous prime is 20405041. The next prime is 20405057. The reversal of 20405050 is 5050402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20405057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44422 + ... + 44878.

It is an arithmetic number, because the mean of its divisors is an integer number (851880).

Almost surely, 2^20405050 is an apocalyptic number.

20405050 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20405050 is a wasteful number, since it uses less digits than its factorization.

20405050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20405050 is about 4517.1949260575. The cubic root of 20405050 is about 273.2619864679.

Adding to 20405050 its reverse (5050402), we get a palindrome (25455452).

The spelling of 20405050 in words is "twenty million, four hundred five thousand, fifty".