216450020 has 24 divisors (see below), whose sum is σ = 458719800. Its totient is φ = 85784832.

The previous prime is 216450019. The next prime is 216450061. The reversal of 216450020 is 20054612.

It is a happy number.

216450020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 109286116 + 107163904 = 10454^2 + 10352^2 .

It is a super-2 number, since 2×216450020² = 93701222316000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 216449974 and 216450001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47465 + ... + 51824.

It is an arithmetic number, because the mean of its divisors is an integer number (19113325).

Almost surely, 2^216450020 is an apocalyptic number.

216450020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216450020 is an abundant number, since it is smaller than the sum of its proper divisors (242269780).

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

216450020 is a wasteful number, since it uses less digits than its factorization.

216450020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99407 (or 99405 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 216450020 is about 14712.2404819932. The cubic root of 216450020 is about 600.4163961421.

The spelling of 216450020 in words is "two hundred sixteen million, four hundred fifty thousand, twenty".