20871842707 has 4 divisors (see below), whose sum is σ = 20872277320. Its totient is φ = 20871408096.

The previous prime is 20871842689. The next prime is 20871842731. The reversal of 20871842707 is 70724817802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20871842707 - 2¹⁵ = 20871809939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871840707) 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 3 ways as a sum of consecutive naturals, for example, 134838 + ... + 244795.

It is an arithmetic number, because the mean of its divisors is an integer number (5218069330).

Almost surely, 2^20871842707 is an apocalyptic number.

20871842707 is a deficient number, since it is larger than the sum of its proper divisors (434613).

20871842707 is an equidigital number, since it uses as much as digits as its factorization.

20871842707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434612.

The product of its (nonzero) digits is 351232, while the sum is 46.

The spelling of 20871842707 in words is "twenty billion, eight hundred seventy-one million, eight hundred forty-two thousand, seven hundred seven".