206172065020 has 24 divisors (see below), whose sum is σ = 440299666800. Its totient is φ = 81071048832.

The previous prime is 206172065017. The next prime is 206172065051. The reversal of 206172065020 is 20560271602.

It is a super-2 number, since 2×206172065020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 87359865 + ... + 87362224.

It is an arithmetic number, because the mean of its divisors is an integer number (18345819450).

Almost surely, 2^206172065020 is an apocalyptic number.

206172065020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206172065020 is an abundant number, since it is smaller than the sum of its proper divisors (234127601780).

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

206172065020 is a wasteful number, since it uses less digits than its factorization.

206172065020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174722157 (or 174722155 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 206172065020 in words is "two hundred six billion, one hundred seventy-two million, sixty-five thousand, twenty".