20158735520 has 288 divisors, whose sum is σ = 62983267200. Its totient is φ = 5951784960.

The previous prime is 20158735481. The next prime is 20158735543. The reversal of 20158735520 is 2553785102.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2570966 + ... + 2578794.

It is an arithmetic number, because the mean of its divisors is an integer number (218691900).

Almost surely, 2^20158735520 is an apocalyptic number.

20158735520 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 20158735520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31491633600).

20158735520 is an abundant number, since it is smaller than the sum of its proper divisors (42824531680).

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

20158735520 is a wasteful number, since it uses less digits than its factorization.

20158735520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7892 (or 7873 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 20158735520 in words is "twenty billion, one hundred fifty-eight million, seven hundred thirty-five thousand, five hundred twenty".