20618965559348 has 24 divisors (see below), whose sum is σ = 38863018392072. Its totient is φ = 9515417393664.

The previous prime is 20618965559341. The next prime is 20618965559359. The reversal of 20618965559348 is 84395556981602.

It can be written as a sum of positive squares in 4 ways, for example, as 539443243024 + 20079522316324 = 734468^2 + 4481018^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618965559341) 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, 20935865 + ... + 21898592.

It is an arithmetic number, because the mean of its divisors is an integer number (1619292433003).

Almost surely, 2^{20618965559348} is an apocalyptic number.

It is an amenable number.

20618965559348 is a deficient number, since it is larger than the sum of its proper divisors (18244052832724).

20618965559348 is a wasteful number, since it uses less digits than its factorization.

20618965559348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42843731 (or 42843729 counting only the distinct ones).

The product of its (nonzero) digits is 559872000, while the sum is 71.

The spelling of 20618965559348 in words is "twenty trillion, six hundred eighteen billion, nine hundred sixty-five million, five hundred fifty-nine thousand, three hundred forty-eight".