18025446820 has 24 divisors (see below), whose sum is σ = 38104129728. Its totient is φ = 7162428000.

The previous prime is 18025446809. The next prime is 18025446821. The reversal of 18025446820 is 2864452081.

It is a happy number.

It is a super-2 number, since 2×18025446820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18025446821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2981326 + ... + 2987365.

It is an arithmetic number, because the mean of its divisors is an integer number (1587672072).

Almost surely, 2^18025446820 is an apocalyptic number.

18025446820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18025446820 is an abundant number, since it is smaller than the sum of its proper divisors (20078682908).

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

18025446820 is a wasteful number, since it uses less digits than its factorization.

18025446820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968851 (or 5968849 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 18025446820 in words is "eighteen billion, twenty-five million, four hundred forty-six thousand, eight hundred twenty".