20173920157944 has 128 divisors (see below), whose sum is σ = 64073037388800. Its totient is φ = 5761381011840.

The previous prime is 20173920157837. The next prime is 20173920157981. The reversal of 20173920157944 is 44975102937102.

20173920157944 is a `hidden beast` number, since 2 + 0 + 1 + 7 + 3 + 9 + 20 + 1 + 579 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354429 + ... + 6361875.

It is an arithmetic number, because the mean of its divisors is an integer number (500570604600).

Almost surely, 2^{20173920157944} is an apocalyptic number.

20173920157944 is a gapful number since it is divisible by the number (24) 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 20173920157944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32036518694400).

20173920157944 is an abundant number, since it is smaller than the sum of its proper divisors (43899117230856).

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

20173920157944 is a wasteful number, since it uses less digits than its factorization.

20173920157944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6009690 (or 6009680 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 20173920157944 in words is "twenty trillion, one hundred seventy-three billion, nine hundred twenty million, one hundred fifty-seven thousand, nine hundred forty-four".