20989780482 has 64 divisors (see below), whose sum is σ = 47425357440. Its totient is φ = 6138163200.

The previous prime is 20989780477. The next prime is 20989780499. The reversal of 20989780482 is 28408798902.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164194 + ... + 262562.

It is an arithmetic number, because the mean of its divisors is an integer number (741021210).

Almost surely, 2^20989780482 is an apocalyptic number.

20989780482 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20989780482, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23712678720).

20989780482 is an abundant number, since it is smaller than the sum of its proper divisors (26435576958).

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

20989780482 is a wasteful number, since it uses less digits than its factorization.

20989780482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98499.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 20989780482 in words is "twenty billion, nine hundred eighty-nine million, seven hundred eighty thousand, four hundred eighty-two".