20559817242 has 12 divisors (see below), whose sum is σ = 44546270730. Its totient is φ = 6853272408.

The previous prime is 20559817189. The next prime is 20559817249. The reversal of 20559817242 is 24271895502.

20559817242 is a `hidden beast` number, since 2 + 0 + 5 + 598 + 17 + 2 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16638678081 + 3921139161 = 128991^2 + 62619^2 .

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 in 5 ways as a sum of consecutive naturals, for example, 571106017 + ... + 571106052.

Almost surely, 2^20559817242 is an apocalyptic number.

20559817242 is an abundant number, since it is smaller than the sum of its proper divisors (23986453488).

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

20559817242 is a wasteful number, since it uses less digits than its factorization.

20559817242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142212077 (or 1142212074 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 20559817242 in words is "twenty billion, five hundred fifty-nine million, eight hundred seventeen thousand, two hundred forty-two".