218442020 has 24 divisors (see below), whose sum is σ = 459043200. Its totient is φ = 87316832.

The previous prime is 218442019. The next prime is 218442023. The reversal of 218442020 is 20244812.

It is a happy number.

It is a super-2 number, since 2×218442020² = 95433832203360800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218442023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36821 + ... + 42339.

It is an arithmetic number, because the mean of its divisors is an integer number (19126800).

Almost surely, 2^218442020 is an apocalyptic number.

218442020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218442020 is an abundant number, since it is smaller than the sum of its proper divisors (240601180).

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

218442020 is a wasteful number, since it uses less digits than its factorization.

218442020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507 (or 7505 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 218442020 is about 14779.7841662184. The cubic root of 218442020 is about 602.2526615717.

Adding to 218442020 its reverse (20244812), we get a palindrome (238686832).

The spelling of 218442020 in words is "two hundred eighteen million, four hundred forty-two thousand, twenty".