206819964 has 36 divisors (see below), whose sum is σ = 563011176. Its totient is φ = 63636768.

The previous prime is 206819923. The next prime is 206819969. The reversal of 206819964 is 469918602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×206819964² = 85548995017922592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206819969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220494 + ... + 221429.

Almost surely, 2^206819964 is an apocalyptic number.

It is an amenable number.

206819964 is an abundant number, since it is smaller than the sum of its proper divisors (356191212).

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

206819964 is a wasteful number, since it uses less digits than its factorization.

206819964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441946 (or 441941 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 206819964 is about 14381.2365254174. The cubic root of 206819964 is about 591.3766226963.

The spelling of 206819964 in words is "two hundred six million, eight hundred nineteen thousand, nine hundred sixty-four".