2154664020 has 48 divisors (see below), whose sum is σ = 6076486080. Its totient is φ = 570441216.

The previous prime is 2154663983. The next prime is 2154664037. The reversal of 2154664020 is 204664512.

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

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 120837 + ... + 137516.

It is an arithmetic number, because the mean of its divisors is an integer number (126593460).

Almost surely, 2^2154664020 is an apocalyptic number.

2154664020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154664020 is an abundant number, since it is smaller than the sum of its proper divisors (3921822060).

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

2154664020 is a wasteful number, since it uses less digits than its factorization.

2154664020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258504 (or 258502 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2154664020 is about 46418.3586525849. The cubic root of 2154664020 is about 1291.5954899570.

The spelling of 2154664020 in words is "two billion, one hundred fifty-four million, six hundred sixty-four thousand, twenty".