20408880520 has 32 divisors (see below), whose sum is σ = 52479979200. Its totient is φ = 6997330368.

The previous prime is 20408880517. The next prime is 20408880523. The reversal of 20408880520 is 2508880402.

It is an interprime number because it is at equal distance from previous prime (20408880517) and next prime (20408880523).

It is a self number, because there is not a number n which added to its sum of digits gives 20408880520.

It is not an unprimeable number, because it can be changed into a prime (20408880523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36444150 + ... + 36444709.

It is an arithmetic number, because the mean of its divisors is an integer number (1639999350).

Almost surely, 2^20408880520 is an apocalyptic number.

20408880520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20408880520 is an abundant number, since it is smaller than the sum of its proper divisors (32071098680).

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

20408880520 is a wasteful number, since it uses less digits than its factorization.

20408880520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72888877 (or 72888873 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The spelling of 20408880520 in words is "twenty billion, four hundred eight million, eight hundred eighty thousand, five hundred twenty".