20180623985 has 4 divisors (see below), whose sum is σ = 24216748788. Its totient is φ = 16144499184.

The previous prime is 20180623933. The next prime is 20180623997. The reversal of 20180623985 is 58932608102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12757250704 + 7423373281 = 112948^2 + 86159^2 .

It is a cyclic number.

It is not a de Polignac number, because 20180623985 - 2¹⁸ = 20180361841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018062394 + ... + 2018062403.

It is an arithmetic number, because the mean of its divisors is an integer number (6054187197).

Almost surely, 2^20180623985 is an apocalyptic number.

It is an amenable number.

20180623985 is a deficient number, since it is larger than the sum of its proper divisors (4036124803).

20180623985 is an equidigital number, since it uses as much as digits as its factorization.

20180623985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036124802.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 20180623985 in words is "twenty billion, one hundred eighty million, six hundred twenty-three thousand, nine hundred eighty-five".