206421424 has 40 divisors (see below), whose sum is σ = 442471680. Its totient is φ = 92500800.

The previous prime is 206421419. The next prime is 206421427. The reversal of 206421424 is 424124602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (206421427) 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, 4237 + ... + 20755.

It is an arithmetic number, because the mean of its divisors is an integer number (11061792).

Almost surely, 2^206421424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206421424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221235840).

206421424 is an abundant number, since it is smaller than the sum of its proper divisors (236050256).

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

206421424 is a wasteful number, since it uses less digits than its factorization.

206421424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16609 (or 16603 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 206421424 is about 14367.3735943630. The cubic root of 206421424 is about 590.9965194963.

The spelling of 206421424 in words is "two hundred six million, four hundred twenty-one thousand, four hundred twenty-four".