20173950720 has 1620 divisors, whose sum is σ = 96680435544. Its totient is φ = 3971358720.

The previous prime is 20173950703. The next prime is 20173950733. The reversal of 20173950720 is 2705937102.

It is a tau number, because it is divible by the number of its divisors (1620).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1061786871 + ... + 1061786889.

Almost surely, 2^20173950720 is an apocalyptic number.

20173950720 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 20173950720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48340217772).

20173950720 is an abundant number, since it is smaller than the sum of its proper divisors (76506484824).

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

20173950720 is a wasteful number, since it uses less digits than its factorization.

20173950720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The spelling of 20173950720 in words is "twenty billion, one hundred seventy-three million, nine hundred fifty thousand, seven hundred twenty".