20559817244 has 6 divisors (see below), whose sum is σ = 35979680184. Its totient is φ = 10279908620.

The previous prime is 20559817189. The next prime is 20559817249. The reversal of 20559817244 is 44271895502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559817249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2569977152 + ... + 2569977159.

It is an arithmetic number, because the mean of its divisors is an integer number (5996613364).

Almost surely, 2^20559817244 is an apocalyptic number.

It is an amenable number.

20559817244 is a deficient number, since it is larger than the sum of its proper divisors (15419862940).

20559817244 is a wasteful number, since it uses less digits than its factorization.

20559817244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5139954315 (or 5139954313 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 20559817244 in words is "twenty billion, five hundred fifty-nine million, eight hundred seventeen thousand, two hundred forty-four".