20055405 has 8 divisors (see below), whose sum is σ = 32088672. Its totient is φ = 10696208.

The previous prime is 20055403. The next prime is 20055407. The reversal of 20055405 is 50455002.

It is an interprime number because it is at equal distance from previous prime (20055403) and next prime (20055407).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20055405 - 2¹ = 20055403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668499 + ... + 668528.

It is an arithmetic number, because the mean of its divisors is an integer number (4011084).

Almost surely, 2^20055405 is an apocalyptic number.

It is an amenable number.

20055405 is a deficient number, since it is larger than the sum of its proper divisors (12033267).

20055405 is a wasteful number, since it uses less digits than its factorization.

20055405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337035.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20055405 is about 4478.3261381905. The cubic root of 20055405 is about 271.6921844039.

The spelling of 20055405 in words is "twenty million, fifty-five thousand, four hundred five".