218997944020 has 96 divisors (see below), whose sum is σ = 509128704000. Its totient is φ = 78755048064.

The previous prime is 218997943907. The next prime is 218997944023. The reversal of 218997944020 is 20449799812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218997944023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1011331 + ... + 1208629.

It is an arithmetic number, because the mean of its divisors is an integer number (5303424000).

Almost surely, 2^218997944020 is an apocalyptic number.

218997944020 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 218997944020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254564352000).

218997944020 is an abundant number, since it is smaller than the sum of its proper divisors (290130759980).

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

218997944020 is a wasteful number, since it uses less digits than its factorization.

218997944020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197477 (or 197475 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 218997944020 in words is "two hundred eighteen billion, nine hundred ninety-seven million, nine hundred forty-four thousand, twenty".