20512112004985 has 32 divisors (see below), whose sum is σ = 25266268984320. Its totient is φ = 15982677079488.

The previous prime is 20512112004977. The next prime is 20512112005039. The reversal of 20512112004985 is 58940021121502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20512112004985 - 2³ = 20512112004977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6320614 + ... + 8998576.

It is an arithmetic number, because the mean of its divisors is an integer number (789570905760).

Almost surely, 2^{20512112004985} is an apocalyptic number.

It is an amenable number.

20512112004985 is a deficient number, since it is larger than the sum of its proper divisors (4754156979335).

20512112004985 is a wasteful number, since it uses less digits than its factorization.

20512112004985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678317.

The product of its (nonzero) digits is 57600, while the sum is 40.

It can be divided in two parts, 2051211 and 2004985, that added together give a square (4056196 = 2014²).

The spelling of 20512112004985 in words is "twenty trillion, five hundred twelve billion, one hundred twelve million, four thousand, nine hundred eighty-five".