2005455220 has 24 divisors (see below), whose sum is σ = 4301063424. Its totient is φ = 785114016.

The previous prime is 2005455163. The next prime is 2005455223. The reversal of 2005455220 is 225545002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005455223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065792 + ... + 1067671.

It is an arithmetic number, because the mean of its divisors is an integer number (179210976).

Almost surely, 2^2005455220 is an apocalyptic number.

2005455220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2005455220 is an abundant number, since it is smaller than the sum of its proper divisors (2295608204).

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

2005455220 is a wasteful number, since it uses less digits than its factorization.

2005455220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133519 (or 2133517 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 2005455220 is about 44782.3092303200. The cubic root of 2005455220 is about 1261.0655343739.

The spelling of 2005455220 in words is "two billion, five million, four hundred fifty-five thousand, two hundred twenty".