20559206040 has 64 divisors (see below), whose sum is σ = 61692883200. Its totient is φ = 5481098112.

The previous prime is 20559206039. The next prime is 20559206051. The reversal of 20559206040 is 4060295502.

It is a junction number, because it is equal to n+sod(n) for n = 20559205992 and 20559206010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523821 + ... + 561699.

It is an arithmetic number, because the mean of its divisors is an integer number (963951300).

Almost surely, 2^20559206040 is an apocalyptic number.

20559206040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20559206040 is an abundant number, since it is smaller than the sum of its proper divisors (41133677160).

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

20559206040 is a wasteful number, since it uses less digits than its factorization.

20559206040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42416 (or 42412 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 20559206040 in words is "twenty billion, five hundred fifty-nine million, two hundred six thousand, forty".