20055390 has 16 divisors (see below), whose sum is σ = 48133008. Its totient is φ = 5348096.

The previous prime is 20055377. The next prime is 20055391. The reversal of 20055390 is 9355002.

It is a self number, because there is not a number n which added to its sum of digits gives 20055390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055391) 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, 334227 + ... + 334286.

It is an arithmetic number, because the mean of its divisors is an integer number (3008313).

Almost surely, 2^20055390 is an apocalyptic number.

20055390 is an abundant number, since it is smaller than the sum of its proper divisors (28077618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20055390 is a wasteful number, since it uses less digits than its factorization.

20055390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668523.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 20055390 is about 4478.3244634573. The cubic root of 20055390 is about 271.6921166684.

The spelling of 20055390 in words is "twenty million, fifty-five thousand, three hundred ninety".