20105055 has 24 divisors (see below), whose sum is σ = 35018880. Its totient is φ = 10670400.

The previous prime is 20105053. The next prime is 20105087. The reversal of 20105055 is 55050102.

It is not a de Polignac number, because 20105055 - 2¹ = 20105053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105053) 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, 9330 + ... + 11280.

It is an arithmetic number, because the mean of its divisors is an integer number (1459120).

Almost surely, 2^20105055 is an apocalyptic number.

20105055 is a deficient number, since it is larger than the sum of its proper divisors (14913825).

20105055 is a wasteful number, since it uses less digits than its factorization.

20105055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 20105055 is about 4483.8660773935. The cubic root of 20105055 is about 271.9162038224.

Adding to 20105055 its reverse (55050102), we get a palindrome (75155157).

The spelling of 20105055 in words is "twenty million, one hundred five thousand, fifty-five".