206686220880 has 40 divisors (see below), whose sum is σ = 640727285472. Its totient is φ = 55116325504.

The previous prime is 206686220879. The next prime is 206686220893. The reversal of 206686220880 is 88022686602.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×206686220880² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 430596054 + ... + 430596533.

Almost surely, 2^206686220880 is an apocalyptic number.

206686220880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206686220880 is an abundant number, since it is smaller than the sum of its proper divisors (434041064592).

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

206686220880 is a wasteful number, since it uses less digits than its factorization.

206686220880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861192603 (or 861192597 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 206686220880 in words is "two hundred six billion, six hundred eighty-six million, two hundred twenty thousand, eight hundred eighty".