20369985 has 16 divisors (see below), whose sum is σ = 32685120. Its totient is φ = 10832960.

The previous prime is 20369981. The next prime is 20370011. The reversal of 20369985 is 58996302.

It is not a de Polignac number, because 20369985 - 2² = 20369981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20369981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4090 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (2042820).

Almost surely, 2^20369985 is an apocalyptic number.

It is an amenable number.

20369985 is a deficient number, since it is larger than the sum of its proper divisors (12315135).

20369985 is a wasteful number, since it uses less digits than its factorization.

20369985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20369985 is about 4513.3119768082. The cubic root of 20369985 is about 273.1053679595.

It can be divided in two parts, 2036 and 9985, that added together give a palindrome (12021).

The spelling of 20369985 in words is "twenty million, three hundred sixty-nine thousand, nine hundred eighty-five".