216100020 has 48 divisors (see below), whose sum is σ = 605787840. Its totient is φ = 57559296.

The previous prime is 216099953. The next prime is 216100037. The reversal of 216100020 is 20001612.

216100020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 216099969 and 216100005.

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, 70071 + ... + 73089.

It is an arithmetic number, because the mean of its divisors is an integer number (12620580).

Almost surely, 2^216100020 is an apocalyptic number.

216100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216100020 is an abundant number, since it is smaller than the sum of its proper divisors (389687820).

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

216100020 is a wasteful number, since it uses less digits than its factorization.

216100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224 (or 4222 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 216100020 is about 14700.3408123757. The cubic root of 216100020 is about 600.0925968201.

Adding to 216100020 its reverse (20001612), we get a palindrome (236101632).

The spelling of 216100020 in words is "two hundred sixteen million, one hundred thousand, twenty".