20851213910774 has 32 divisors (see below), whose sum is σ = 34186413676800. Its totient is φ = 9479735651232.

The previous prime is 20851213910743. The next prime is 20851213910809. The reversal of 20851213910774 is 47701931215802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70750607 + ... + 71044709.

It is an arithmetic number, because the mean of its divisors is an integer number (1068325427400).

Almost surely, 2^{20851213910774} is an apocalyptic number.

20851213910774 is a deficient number, since it is larger than the sum of its proper divisors (13335199766026).

20851213910774 is a wasteful number, since it uses less digits than its factorization.

20851213910774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334884.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 20851213910774 in words is "twenty trillion, eight hundred fifty-one billion, two hundred thirteen million, nine hundred ten thousand, seven hundred seventy-four".