20202985 has 16 divisors (see below), whose sum is σ = 27840960. Its totient is φ = 13919040.

The previous prime is 20202961. The next prime is 20202989. The reversal of 20202985 is 58920202.

20202985 = 201² + 202² + ... + 409².

It is not a de Polignac number, because 20202985 - 2¹¹ = 20200937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20202989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8622 + ... + 10711.

It is an arithmetic number, because the mean of its divisors is an integer number (1740060).

Almost surely, 2^20202985 is an apocalyptic number.

It is an amenable number.

20202985 is a deficient number, since it is larger than the sum of its proper divisors (7637975).

20202985 is a wasteful number, since it uses less digits than its factorization.

20202985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19368.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20202985 is about 4494.7730754733. The cubic root of 20202985 is about 272.3569824392.

It can be divided in two parts, 2020 and 2985, that added together give a palindrome (5005).

The spelling of 20202985 in words is "twenty million, two hundred two thousand, nine hundred eighty-five".