20135555 has 16 divisors (see below), whose sum is σ = 26460000. Its totient is φ = 14588160.

The previous prime is 20135539. The next prime is 20135587. The reversal of 20135555 is 55553102.

It is not a de Polignac number, because 20135555 - 2⁴ = 20135539 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18671 + ... + 19719.

It is an arithmetic number, because the mean of its divisors is an integer number (1653750).

Almost surely, 2^20135555 is an apocalyptic number.

20135555 is a deficient number, since it is larger than the sum of its proper divisors (6324445).

20135555 is a wasteful number, since it uses less digits than its factorization.

20135555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 20135555 is about 4487.2658713297. The cubic root of 20135555 is about 272.0536361571.

Adding to 20135555 its reverse (55553102), we get a palindrome (75688657).

The spelling of 20135555 in words is "twenty million, one hundred thirty-five thousand, five hundred fifty-five".