20985401579 has 8 divisors (see below), whose sum is σ = 22221168048. Its totient is φ = 19749783040.

The previous prime is 20985401539. The next prime is 20985401617. The reversal of 20985401579 is 97510458902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20985401579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20985401539) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 408524 + ... + 457014.

It is an arithmetic number, because the mean of its divisors is an integer number (2777646006).

Almost surely, 2^20985401579 is an apocalyptic number.

20985401579 is a deficient number, since it is larger than the sum of its proper divisors (1235766469).

20985401579 is a wasteful number, since it uses less digits than its factorization.

20985401579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73965.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 20985401579 in words is "twenty billion, nine hundred eighty-five million, four hundred one thousand, five hundred seventy-nine".