206615020 has 24 divisors (see below), whose sum is σ = 439387200. Its totient is φ = 81599232.

The previous prime is 206615011. The next prime is 206615023. The reversal of 206615020 is 20516602.

It is a junction number, because it is equal to n+sod(n) for n = 206614982 and 206615000.

It is not an unprimeable number, because it can be changed into a prime (206615023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63805 + ... + 66964.

It is an arithmetic number, because the mean of its divisors is an integer number (18307800).

Almost surely, 2^206615020 is an apocalyptic number.

206615020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206615020 is an abundant number, since it is smaller than the sum of its proper divisors (232772180).

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

206615020 is a wasteful number, since it uses less digits than its factorization.

206615020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130857 (or 130855 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 206615020 is about 14374.1093637136. The cubic root of 206615020 is about 591.1812206286.

The spelling of 206615020 in words is "two hundred six million, six hundred fifteen thousand, twenty".