20905050 has 24 divisors (see below), whose sum is σ = 51844896. Its totient is φ = 5574640.

The previous prime is 20905033. The next prime is 20905051. The reversal of 20905050 is 5050902.

It is a super-2 number, since 2×20905050² = 874042231005000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20905051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69534 + ... + 69833.

It is an arithmetic number, because the mean of its divisors is an integer number (2160204).

Almost surely, 2^20905050 is an apocalyptic number.

20905050 is an abundant number, since it is smaller than the sum of its proper divisors (30939846).

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

20905050 is a wasteful number, since it uses less digits than its factorization.

20905050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139382 (or 139377 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 20905050 is about 4572.2040636874. The cubic root of 20905050 is about 275.4759800886.

Adding to 20905050 its reverse (5050902), we get a palindrome (25955952).

It can be divided in two parts, 2090 and 5050, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 20905050 in words is "twenty million, nine hundred five thousand, fifty".