20055109 has 12 divisors (see below), whose sum is σ = 21270060. Its totient is φ = 18897600.

The previous prime is 20055097. The next prime is 20055131. The reversal of 20055109 is 90155002.

It can be written as a sum of positive squares in 2 ways, for example, as 7784100 + 12271009 = 2790^2 + 3503^2 .

It is not a de Polignac number, because 20055109 - 2²¹ = 17957957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20055109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055179) 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, 39147 + ... + 39655.

It is an arithmetic number, because the mean of its divisors is an integer number (1772505).

Almost surely, 2^20055109 is an apocalyptic number.

It is an amenable number.

20055109 is a deficient number, since it is larger than the sum of its proper divisors (1214951).

20055109 is an equidigital number, since it uses as much as digits as its factorization.

20055109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 20055109 is about 4478.2930900065. The cubic root of 20055109 is about 271.6908477520.

It can be divided in two parts, 20055 and 109, that added together give a square (20164 = 142²).

The spelling of 20055109 in words is "twenty million, fifty-five thousand, one hundred nine".