20851186873936 has 10 divisors (see below), whose sum is σ = 40399174568282. Its totient is φ = 10425593436960.

The previous prime is 20851186873921. The next prime is 20851186874009. The reversal of 20851186873936 is 63937868115802.

It can be written as a sum of positive squares in only one way, i.e., 18267452113936 + 2583734760000 = 4274044^2 + 1607400^2 .

It is a super-2 number, since 2×20851186873936² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651599589795 + ... + 651599589826.

Almost surely, 2^{20851186873936} is an apocalyptic number.

It is an amenable number.

20851186873936 is a deficient number, since it is larger than the sum of its proper divisors (19547987694346).

20851186873936 is a wasteful number, since it uses less digits than its factorization.

20851186873936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303199179629 (or 1303199179623 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 67.

The spelling of 20851186873936 in words is "twenty trillion, eight hundred fifty-one billion, one hundred eighty-six million, eight hundred seventy-three thousand, nine hundred thirty-six".