243668856020 has 24 divisors (see below), whose sum is σ = 511717537800. Its totient is φ = 97465077632.

The previous prime is 243668856017. The next prime is 243668856029. The reversal of 243668856020 is 20658866342.

It can be written as a sum of positive squares in 4 ways, for example, as 23912292496 + 219756563524 = 154636^2 + 468782^2 .

It is a super-2 number, since 2×243668856020² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243668856020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243668856029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 801026 + ... + 1062534.

It is an arithmetic number, because the mean of its divisors is an integer number (21321564075).

Almost surely, 2^243668856020 is an apocalyptic number.

243668856020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243668856020 is an abundant number, since it is smaller than the sum of its proper divisors (268048681780).

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

243668856020 is a wasteful number, since it uses less digits than its factorization.

243668856020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308107 (or 308105 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 50.

The spelling of 243668856020 in words is "two hundred forty-three billion, six hundred sixty-eight million, eight hundred fifty-six thousand, twenty".