100000020985 has 8 divisors (see below), whose sum is σ = 120011790600. Its totient is φ = 79992173184.

The previous prime is 100000020971. The next prime is 100000021001. The reversal of 100000020985 is 589020000001.

It can be written as a sum of positive squares in 4 ways, for example, as 18804088384 + 81195932601 = 137128^2 + 284949^2 .

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 100000020985 - 2²¹ = 99997923833 is a prime.

It is a super-3 number, since 3×100000020985³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924060 + ... + 1026589.

It is an arithmetic number, because the mean of its divisors is an integer number (15001473825).

Almost surely, 2^100000020985 is an apocalyptic number.

It is an amenable number.

100000020985 is a deficient number, since it is larger than the sum of its proper divisors (20011769615).

100000020985 is a wasteful number, since it uses less digits than its factorization.

100000020985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960907.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 100000020985 its reverse (589020000001), we get a palindrome (689020020986).

The spelling of 100000020985 in words is "one hundred billion, twenty thousand, nine hundred eighty-five".