20561050 has 24 divisors (see below), whose sum is σ = 38480796. Its totient is φ = 8173440.

The previous prime is 20561033. The next prime is 20561053. The reversal of 20561050 is 5016502.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 11215801 + 9345249 = 3349^2 + 3057^2 .

It is not an unprimeable number, because it can be changed into a prime (20561053) 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, 7462 + ... + 9838.

Almost surely, 2^20561050 is an apocalyptic number.

20561050 is a deficient number, since it is larger than the sum of its proper divisors (17919746).

20561050 is a wasteful number, since it uses less digits than its factorization.

20561050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20561050 is about 4534.4294018101. The cubic root of 20561050 is about 273.9565970998.

Adding to 20561050 its reverse (5016502), we get a palindrome (25577552).

The spelling of 20561050 in words is "twenty million, five hundred sixty-one thousand, fifty".