408216020 has 12 divisors (see below), whose sum is σ = 857253684. Its totient is φ = 163286400.

The previous prime is 408216001. The next prime is 408216031. The reversal of 408216020 is 20612804.

It can be written as a sum of positive squares in 2 ways, for example, as 295771204 + 112444816 = 17198^2 + 10604^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10205381 + ... + 10205420.

It is an arithmetic number, because the mean of its divisors is an integer number (71437807).

Almost surely, 2^408216020 is an apocalyptic number.

It is an amenable number.

408216020 is an abundant number, since it is smaller than the sum of its proper divisors (449037664).

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

408216020 is a wasteful number, since it uses less digits than its factorization.

408216020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20410810 (or 20410808 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 408216020 is about 20204.3564609220. The cubic root of 408216020 is about 741.8168286339.

Adding to 408216020 its reverse (20612804), we get a palindrome (428828824).

It can be divided in two parts, 4082 and 16020, that added together give a palindrome (20102).

The spelling of 408216020 in words is "four hundred eight million, two hundred sixteen thousand, twenty".