20031597981986 has 16 divisors (see below), whose sum is σ = 32289740034336. Its totient is φ = 9285938308416.

The previous prime is 20031597981973. The next prime is 20031597982093. The reversal of 20031597981986 is 68918979513002.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 4396748816 + ... + 4396753371.

It is an arithmetic number, because the mean of its divisors is an integer number (2018108752146).

Almost surely, 2^{20031597981986} is an apocalyptic number.

20031597981986 is a deficient number, since it is larger than the sum of its proper divisors (12258142052350).

20031597981986 is a wasteful number, since it uses less digits than its factorization.

20031597981986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8793502273.

The product of its (nonzero) digits is 58786560, while the sum is 68.

The spelling of 20031597981986 in words is "twenty trillion, thirty-one billion, five hundred ninety-seven million, nine hundred eighty-one thousand, nine hundred eighty-six".