206120900 has 18 divisors (see below), whose sum is σ = 447282570. Its totient is φ = 82448320.

The previous prime is 206120879. The next prime is 206120909. The reversal of 206120900 is 9021602.

It can be written as a sum of positive squares in 3 ways, for example, as 1459264 + 204661636 = 1208^2 + 14306^2 .

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

It is not an unprimeable number, because it can be changed into a prime (206120909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030505 + ... + 1030704.

Almost surely, 2^206120900 is an apocalyptic number.

206120900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206120900 is an abundant number, since it is smaller than the sum of its proper divisors (241161670).

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

206120900 is a wasteful number, since it uses less digits than its factorization.

206120900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061223 (or 2061216 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 206120900 is about 14356.9112276980. The cubic root of 206120900 is about 590.7095743133.

The spelling of 206120900 in words is "two hundred six million, one hundred twenty thousand, nine hundred".