20771857210 has 32 divisors (see below), whose sum is σ = 41564339712. Its totient is φ = 7422200640.

The previous prime is 20771857159. The next prime is 20771857219. The reversal of 20771857210 is 1275817702.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20771857219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2573124 + ... + 2581183.

It is an arithmetic number, because the mean of its divisors is an integer number (1298885616).

Almost surely, 2^20771857210 is an apocalyptic number.

20771857210 is an abundant number, since it is smaller than the sum of its proper divisors (20792482502).

20771857210 is a wasteful number, since it uses less digits than its factorization.

20771857210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5154358.

The product of its (nonzero) digits is 54880, while the sum is 40.

The spelling of 20771857210 in words is "twenty billion, seven hundred seventy-one million, eight hundred fifty-seven thousand, two hundred ten".