20989780483 has 18 divisors (see below), whose sum is σ = 25229782548. Its totient is φ = 17410838760.

The previous prime is 20989780477. The next prime is 20989780499. The reversal of 20989780483 is 38408798902.

It is not a de Polignac number, because 20989780483 - 2⁵ = 20989780451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20989780403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 175785 + ... + 269962.

It is an arithmetic number, because the mean of its divisors is an integer number (1401654586).

Almost surely, 2^20989780483 is an apocalyptic number.

20989780483 is a deficient number, since it is larger than the sum of its proper divisors (4240002065).

20989780483 is an equidigital number, since it uses as much as digits as its factorization.

20989780483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445823 (or 445785 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 20989780483 in words is "twenty billion, nine hundred eighty-nine million, seven hundred eighty thousand, four hundred eighty-three".