20355665244 has 12 divisors (see below), whose sum is σ = 47496552264. Its totient is φ = 6785221744.

The previous prime is 20355665227. The next prime is 20355665249. The reversal of 20355665244 is 44256655302.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×20355665244³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20355665196 and 20355665205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355665249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 848152707 + ... + 848152730.

It is an arithmetic number, because the mean of its divisors is an integer number (3958046022).

Almost surely, 2^20355665244 is an apocalyptic number.

It is an amenable number.

20355665244 is an abundant number, since it is smaller than the sum of its proper divisors (27140887020).

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

20355665244 is a wasteful number, since it uses less digits than its factorization.

20355665244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696305444 (or 1696305442 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 20355665244 in words is "twenty billion, three hundred fifty-five million, six hundred sixty-five thousand, two hundred forty-four".