20217815488 has 224 divisors, whose sum is σ = 50264202240. Its totient is φ = 7955988480.

The previous prime is 20217815447. The next prime is 20217815503. The reversal of 20217815488 is 88451871202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6179293 + ... + 6182563.

It is an arithmetic number, because the mean of its divisors is an integer number (224393760).

Almost surely, 2^20217815488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20217815488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25132101120).

20217815488 is an abundant number, since it is smaller than the sum of its proper divisors (30046386752).

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

20217815488 is a wasteful number, since it uses less digits than its factorization.

20217815488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3345 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The spelling of 20217815488 in words is "twenty billion, two hundred seventeen million, eight hundred fifteen thousand, four hundred eighty-eight".