206121700 has 18 divisors (see below), whose sum is σ = 447284306. Its totient is φ = 82448640.

The previous prime is 206121679. The next prime is 206121701. The reversal of 206121700 is 7121602.

It can be written as a sum of positive squares in 3 ways, for example, as 58644964 + 147476736 = 7658^2 + 12144^2 .

It is not an unprimeable number, because it can be changed into a prime (206121701) 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, 1030509 + ... + 1030708.

Almost surely, 2^206121700 is an apocalyptic number.

206121700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206121700 is an abundant number, since it is smaller than the sum of its proper divisors (241162606).

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

206121700 is a wasteful number, since it uses less digits than its factorization.

206121700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061231 (or 2061224 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 206121700 is about 14356.9390888169. The cubic root of 206121700 is about 590.7103385363.

The spelling of 206121700 in words is "two hundred six million, one hundred twenty-one thousand, seven hundred".