20156548893840 has 560 divisors, whose sum is σ = 73899245859840. Its totient is φ = 5103520680960.

The previous prime is 20156548893829. The next prime is 20156548893863. The reversal of 20156548893840 is 4839884565102.

20156548893840 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 6 + 548 + 8 + 9 + 3 + 84 + 0 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 95714581 + ... + 95924939.

Almost surely, 2^{20156548893840} is an apocalyptic number.

20156548893840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20156548893840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36949622929920).

20156548893840 is an abundant number, since it is smaller than the sum of its proper divisors (53742696966000).

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

20156548893840 is a wasteful number, since it uses less digits than its factorization.

20156548893840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210474 (or 210453 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 20156548893840 in words is "twenty trillion, one hundred fifty-six billion, five hundred forty-eight million, eight hundred ninety-three thousand, eight hundred forty".