20257173134156 has 384 divisors, whose sum is σ = 45257603973120. Its totient is φ = 7749972172800.

The previous prime is 20257173134113. The next prime is 20257173134171. The reversal of 20257173134156 is 65143137175202.

It is a self number, because there is not a number n which added to its sum of digits gives 20257173134156.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7606898081 + ... + 7606900743.

It is an arithmetic number, because the mean of its divisors is an integer number (117858343680).

Almost surely, 2^{20257173134156} 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 20257173134156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22628801986560).

20257173134156 is an abundant number, since it is smaller than the sum of its proper divisors (25000430838964).

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

20257173134156 is a wasteful number, since it uses less digits than its factorization.

20257173134156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945 (or 2943 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 20257173134156 in words is "twenty trillion, two hundred fifty-seven billion, one hundred seventy-three million, one hundred thirty-four thousand, one hundred fifty-six".