20408556880 has 80 divisors (see below), whose sum is σ = 50720753664. Its totient is φ = 7618012160.

The previous prime is 20408556871. The next prime is 20408556881. The reversal of 20408556880 is 8865580402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 20408556880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408556881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59824 + ... + 210703.

Almost surely, 2^20408556880 is an apocalyptic number.

20408556880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20408556880 is an abundant number, since it is smaller than the sum of its proper divisors (30312196784).

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

20408556880 is a wasteful number, since it uses less digits than its factorization.

20408556880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270604 (or 270598 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 46.

The spelling of 20408556880 in words is "twenty billion, four hundred eight million, five hundred fifty-six thousand, eight hundred eighty".