20218080 has 96 divisors (see below), whose sum is σ = 64671264. Its totient is φ = 5308416.

The previous prime is 20218067. The next prime is 20218091. The reversal of 20218080 is 8081202.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34752 + ... + 35328.

It is an arithmetic number, because the mean of its divisors is an integer number (673659).

Almost surely, 2^20218080 is an apocalyptic number.

20218080 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 20218080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32335632).

20218080 is an abundant number, since it is smaller than the sum of its proper divisors (44453184).

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

20218080 is a wasteful number, since it uses less digits than its factorization.

20218080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20218080 is about 4496.4519345813. The cubic root of 20218080 is about 272.4247975855.

Adding to 20218080 its reverse (8081202), we get a palindrome (28299282).

It can be divided in two parts, 2021 and 8080, that added together give a palindrome (10101).

The spelling of 20218080 in words is "twenty million, two hundred eighteen thousand, eighty".