20020985 has 8 divisors (see below), whose sum is σ = 25438536. Its totient is φ = 15074560.

The previous prime is 20020943. The next prime is 20021021. The reversal of 20020985 is 58902002.

It can be written as a sum of positive squares in 4 ways, for example, as 6574096 + 13446889 = 2564^2 + 3667^2 .

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

It is not a de Polignac number, because 20020985 - 2²⁴ = 3243769 is a prime.

It is a Duffinian number.

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, 117686 + ... + 117855.

It is an arithmetic number, because the mean of its divisors is an integer number (3179817).

Almost surely, 2^20020985 is an apocalyptic number.

It is an amenable number.

20020985 is a deficient number, since it is larger than the sum of its proper divisors (5417551).

20020985 is a wasteful number, since it uses less digits than its factorization.

20020985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235563.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20020985 is about 4474.4815342115. The cubic root of 20020985 is about 271.5366652308.

Adding to 20020985 its reverse (58902002), we get a palindrome (78922987).

The spelling of 20020985 in words is "twenty million, twenty thousand, nine hundred eighty-five".