20023240985 has 32 divisors (see below), whose sum is σ = 28960872192. Its totient is φ = 13109831680.

The previous prime is 20023240931. The next prime is 20023240987. The reversal of 20023240985 is 58904232002.

It is not a de Polignac number, because 20023240985 - 2⁸ = 20023240729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20023240987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444044 + ... + 487053.

It is an arithmetic number, because the mean of its divisors is an integer number (905027256).

Almost surely, 2^20023240985 is an apocalyptic number.

It is an amenable number.

20023240985 is a deficient number, since it is larger than the sum of its proper divisors (8937631207).

20023240985 is a wasteful number, since it uses less digits than its factorization.

20023240985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931153.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 20023240985 its reverse (58904232002), we get a palindrome (78927472987).

The spelling of 20023240985 in words is "twenty billion, twenty-three million, two hundred forty thousand, nine hundred eighty-five".