20170131771408 has 160 divisors (see below), whose sum is σ = 52464814513152. Its totient is φ = 6677301657600.

The previous prime is 20170131771373. The next prime is 20170131771437. The reversal of 20170131771408 is 80417713107102.

It is a self number, because there is not a number n which added to its sum of digits gives 20170131771408.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6001227648 + ... + 6001231008.

Almost surely, 2^{20170131771408} is an apocalyptic number.

It is an amenable number.

20170131771408 is an abundant number, since it is smaller than the sum of its proper divisors (32294682741744).

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

20170131771408 is a wasteful number, since it uses less digits than its factorization.

20170131771408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993 (or 4987 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 42.

The spelling of 20170131771408 in words is "twenty trillion, one hundred seventy billion, one hundred thirty-one million, seven hundred seventy-one thousand, four hundred eight".