206653640 has 32 divisors (see below), whose sum is σ = 465514560. Its totient is φ = 82564800.

The previous prime is 206653637. The next prime is 206653669. The reversal of 206653640 is 46356602.

It is a junction number, because it is equal to n+sod(n) for n = 206653597 and 206653606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38735 + ... + 43745.

It is an arithmetic number, because the mean of its divisors is an integer number (14547330).

Almost surely, 2^206653640 is an apocalyptic number.

206653640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206653640 is an abundant number, since it is smaller than the sum of its proper divisors (258860920).

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

206653640 is a wasteful number, since it uses less digits than its factorization.

206653640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6053 (or 6049 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 206653640 is about 14375.4526885243. The cubic root of 206653640 is about 591.2180524077.

The spelling of 206653640 in words is "two hundred six million, six hundred fifty-three thousand, six hundred forty".