20808851371 has 32 divisors (see below), whose sum is σ = 27278254080. Its totient is φ = 15398812800.

The previous prime is 20808851369. The next prime is 20808851383. The reversal of 20808851371 is 17315880802.

It is not a de Polignac number, because 20808851371 - 2¹ = 20808851369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20808851771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59830 + ... + 212596.

It is an arithmetic number, because the mean of its divisors is an integer number (852445440).

Almost surely, 2^20808851371 is an apocalyptic number.

20808851371 is a deficient number, since it is larger than the sum of its proper divisors (6469402709).

20808851371 is a wasteful number, since it uses less digits than its factorization.

20808851371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152875.

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 20808851371 in words is "twenty billion, eight hundred eight million, eight hundred fifty-one thousand, three hundred seventy-one".