20102985 has 60 divisors (see below), whose sum is σ = 41961348. Its totient is φ = 9180864.

The previous prime is 20102983. The next prime is 20103047. The reversal of 20102985 is 58920102.

It can be written as a sum of positive squares in 2 ways, for example, as 2286144 + 17816841 = 1512^2 + 4221^2 .

It is not a de Polignac number, because 20102985 - 2¹ = 20102983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102983) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 19339 + ... + 20351.

Almost surely, 2^20102985 is an apocalyptic number.

It is an amenable number.

20102985 is an abundant number, since it is smaller than the sum of its proper divisors (21858363).

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

20102985 is a wasteful number, since it uses less digits than its factorization.

20102985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20102985 is about 4483.6352438618. The cubic root of 20102985 is about 271.9068714123.

The spelling of 20102985 in words is "twenty million, one hundred two thousand, nine hundred eighty-five".