20100550 has 24 divisors (see below), whose sum is σ = 37906056. Its totient is φ = 7928640.

The previous prime is 20100541. The next prime is 20100557. The reversal of 20100550 is 5500102.

It is a super-2 number, since 2×20100550² = 808064220605000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20100550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100557) 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 11 ways as a sum of consecutive naturals, for example, 897 + ... + 6403.

It is an arithmetic number, because the mean of its divisors is an integer number (1579419).

Almost surely, 2^20100550 is an apocalyptic number.

20100550 is a deficient number, since it is larger than the sum of its proper divisors (17805506).

20100550 is a wasteful number, since it uses less digits than its factorization.

20100550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 20100550 is about 4483.3636925862. The cubic root of 20100550 is about 271.8958926121.

Adding to 20100550 its reverse (5500102), we get a palindrome (25600652).

The spelling of 20100550 in words is "twenty million, one hundred thousand, five hundred fifty".