20489485643 has 8 divisors (see below), whose sum is σ = 22353861936. Its totient is φ = 18625392000.

The previous prime is 20489485631. The next prime is 20489485699. The reversal of 20489485643 is 34658498402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20489485643 - 2¹⁰ = 20489484619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20489485243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98543 + ... + 225143.

It is an arithmetic number, because the mean of its divisors is an integer number (2794232742).

Almost surely, 2^20489485643 is an apocalyptic number.

20489485643 is a deficient number, since it is larger than the sum of its proper divisors (1864376293).

20489485643 is a wasteful number, since it uses less digits than its factorization.

20489485643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141325.

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 20489485643 in words is "twenty billion, four hundred eighty-nine million, four hundred eighty-five thousand, six hundred forty-three".