20012985 has 48 divisors (see below), whose sum is σ = 37065600. Its totient is φ = 9960192.

The previous prime is 20012981. The next prime is 20012999. The reversal of 20012985 is 58921002.

It is not a de Polignac number, because 20012985 - 2² = 20012981 is a prime.

It is a super-2 number, since 2×20012985² = 801039137220450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20012981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75964 + ... + 76226.

It is an arithmetic number, because the mean of its divisors is an integer number (772200).

Almost surely, 2^20012985 is an apocalyptic number.

It is an amenable number.

20012985 is a deficient number, since it is larger than the sum of its proper divisors (17052615).

20012985 is a wasteful number, since it uses less digits than its factorization.

20012985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

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

The square root of 20012985 is about 4473.5874865705. The cubic root of 20012985 is about 271.5004934720.

Adding to 20012985 its reverse (58921002), we get a palindrome (78933987).

The spelling of 20012985 in words is "twenty million, twelve thousand, nine hundred eighty-five".