20559167556 has 24 divisors (see below), whose sum is σ = 47984144544. Its totient is φ = 6851233920.

The previous prime is 20559167537. The next prime is 20559167561. The reversal of 20559167556 is 65576195502.

It is a junction number, because it is equal to n+sod(n) for n = 20559167499 and 20559167508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180330 + ... + 271361.

It is an arithmetic number, because the mean of its divisors is an integer number (1999339356).

Almost surely, 2^20559167556 is an apocalyptic number.

It is an amenable number.

20559167556 is an abundant number, since it is smaller than the sum of its proper divisors (27424976988).

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

20559167556 is a wasteful number, since it uses less digits than its factorization.

20559167556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455491 (or 455489 counting only the distinct ones).

The product of its (nonzero) digits is 2835000, while the sum is 51.

The spelling of 20559167556 in words is "twenty billion, five hundred fifty-nine million, one hundred sixty-seven thousand, five hundred fifty-six".