217175772020 has 24 divisors (see below), whose sum is σ = 468395315304. Its totient is φ = 84522462336.

The previous prime is 217175772019. The next prime is 217175772041. The reversal of 217175772020 is 20277571712.

217175772020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8529630736 + 208646141284 = 92356^2 + 456778^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146739647 + ... + 146741126.

It is an arithmetic number, because the mean of its divisors is an integer number (19516471471).

Almost surely, 2^217175772020 is an apocalyptic number.

217175772020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217175772020 is an abundant number, since it is smaller than the sum of its proper divisors (251219543284).

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

217175772020 is a wasteful number, since it uses less digits than its factorization.

217175772020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293480819 (or 293480817 counting only the distinct ones).

The product of its (nonzero) digits is 96040, while the sum is 41.

The spelling of 217175772020 in words is "two hundred seventeen billion, one hundred seventy-five million, seven hundred seventy-two thousand, twenty".