20617049880 has 480 divisors, whose sum is σ = 85362789600. Its totient is φ = 4434683904.

The previous prime is 20617049867. The next prime is 20617049909. The reversal of 20617049880 is 8894071602.

20617049880 is a `hidden beast` number, since 20 + 61 + 7 + 0 + 498 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2695101 + ... + 2702739.

It is an arithmetic number, because the mean of its divisors is an integer number (177839145).

Almost surely, 2^20617049880 is an apocalyptic number.

20617049880 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 20617049880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42681394800).

20617049880 is an abundant number, since it is smaller than the sum of its proper divisors (64745739720).

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

20617049880 is a wasteful number, since it uses less digits than its factorization.

20617049880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7693 (or 7673 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 20617049880 in words is "twenty billion, six hundred seventeen million, forty-nine thousand, eight hundred eighty".