20405118200871 has 16 divisors (see below), whose sum is σ = 27212935208960. Its totient is φ = 13600356956640.

The previous prime is 20405118200867. The next prime is 20405118200911. The reversal of 20405118200871 is 17800281150402.

It is not a de Polignac number, because 20405118200871 - 2² = 20405118200867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405118200801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551158341 + ... + 551195361.

It is an arithmetic number, because the mean of its divisors is an integer number (1700808450560).

Almost surely, 2^{20405118200871} is an apocalyptic number.

20405118200871 is a deficient number, since it is larger than the sum of its proper divisors (6807817008089).

20405118200871 is a wasteful number, since it uses less digits than its factorization.

20405118200871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73326.

The product of its (nonzero) digits is 35840, while the sum is 39.

The spelling of 20405118200871 in words is "twenty trillion, four hundred five billion, one hundred eighteen million, two hundred thousand, eight hundred seventy-one".