206390000 has 50 divisors (see below), whose sum is σ = 499715040. Its totient is φ = 82552000.

The previous prime is 206389999. The next prime is 206390029. The reversal of 206390000 is 93602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (50).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 320 + ... + 20319.

Almost surely, 2^206390000 is an apocalyptic number.

206390000 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 206390000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249857520).

206390000 is an abundant number, since it is smaller than the sum of its proper divisors (293325040).

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

206390000 is an equidigital number, since it uses as much as digits as its factorization.

206390000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20667 (or 20646 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 206390000 is about 14366.2799638598. The cubic root of 206390000 is about 590.9665283956.

The spelling of 206390000 in words is "two hundred six million, three hundred ninety thousand".