20888555520 has 416 divisors, whose sum is σ = 80904538368. Its totient is φ = 4492099584.

The previous prime is 20888555507. The next prime is 20888555533. The reversal of 20888555520 is 2555588802.

It is an interprime number because it is at equal distance from previous prime (20888555507) and next prime (20888555533).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20888555520.

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 31 ways as a sum of consecutive naturals, for example, 7309932 + ... + 7312788.

Almost surely, 2^20888555520 is an apocalyptic number.

20888555520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20888555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40452269184).

20888555520 is an abundant number, since it is smaller than the sum of its proper divisors (60015982848).

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

20888555520 is a wasteful number, since it uses less digits than its factorization.

20888555520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913 (or 2891 counting only the distinct ones).

The product of its (nonzero) digits is 1280000, while the sum is 48.

The spelling of 20888555520 in words is "twenty billion, eight hundred eighty-eight million, five hundred fifty-five thousand, five hundred twenty".