20328555 has 32 divisors (see below), whose sum is σ = 35622720. Its totient is φ = 9838080.

The previous prime is 20328547. The next prime is 20328557. The reversal of 20328555 is 55582302.

It is not a de Polignac number, because 20328555 - 2³ = 20328547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20328557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11041 + ... + 12749.

It is an arithmetic number, because the mean of its divisors is an integer number (1113210).

Almost surely, 2^20328555 is an apocalyptic number.

20328555 is a deficient number, since it is larger than the sum of its proper divisors (15294165).

20328555 is a wasteful number, since it uses less digits than its factorization.

20328555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 20328555 is about 4508.7198848454. The cubic root of 20328555 is about 272.9200882451.

The spelling of 20328555 in words is "twenty million, three hundred twenty-eight thousand, five hundred fifty-five".