820171057704 has 128 divisors (see below), whose sum is σ = 2119978967040. Its totient is φ = 264254764032.

The previous prime is 820171057703. The next prime is 820171057799. The reversal of 820171057704 is 407750171028.

It is not an unprimeable number, because it can be changed into a prime (820171057703) 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, 120027472 + ... + 120034304.

It is an arithmetic number, because the mean of its divisors is an integer number (16562335680).

Almost surely, 2^820171057704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820171057704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1059989483520).

820171057704 is an abundant number, since it is smaller than the sum of its proper divisors (1299807909336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820171057704 is a wasteful number, since it uses less digits than its factorization.

820171057704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079 (or 8075 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 42.

The spelling of 820171057704 in words is "eight hundred twenty billion, one hundred seventy-one million, fifty-seven thousand, seven hundred four".