2154402020 has 24 divisors (see below), whose sum is σ = 4762363200. Its totient is φ = 816404832.

The previous prime is 2154402017. The next prime is 2154402073. The reversal of 2154402020 is 202044512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2154401983 and 2154402001.

It is an unprimeable number.

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, 2834360 + ... + 2835119.

It is an arithmetic number, because the mean of its divisors is an integer number (198431800).

Almost surely, 2^2154402020 is an apocalyptic number.

2154402020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154402020 is an abundant number, since it is smaller than the sum of its proper divisors (2607961180).

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

2154402020 is a wasteful number, since it uses less digits than its factorization.

2154402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669507 (or 5669505 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2154402020 is about 46415.5364075435. The cubic root of 2154402020 is about 1291.5431365920.

Adding to 2154402020 its reverse (202044512), we get a palindrome (2356446532).

The spelling of 2154402020 in words is "two billion, one hundred fifty-four million, four hundred two thousand, twenty".