2154455220 has 144 divisors (see below), whose sum is σ = 6742346688. Its totient is φ = 512179200.

The previous prime is 2154455209. The next prime is 2154455221. The reversal of 2154455220 is 225544512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154455221) 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 47 ways as a sum of consecutive naturals, for example, 365295 + ... + 371145.

It is an arithmetic number, because the mean of its divisors is an integer number (46821852).

Almost surely, 2^2154455220 is an apocalyptic number.

2154455220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154455220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3371173344).

2154455220 is an abundant number, since it is smaller than the sum of its proper divisors (4587891468).

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

2154455220 is a wasteful number, since it uses less digits than its factorization.

2154455220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918 (or 5897 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 2154455220 is about 46416.1094879784. The cubic root of 2154455220 is about 1291.5537674660.

Adding to 2154455220 its reverse (225544512), we get a palindrome (2379999732).

The spelling of 2154455220 in words is "two billion, one hundred fifty-four million, four hundred fifty-five thousand, two hundred twenty".