20353510520 has 128 divisors (see below), whose sum is σ = 54676131840. Its totient is φ = 6667246080.

The previous prime is 20353510511. The next prime is 20353510531. The reversal of 20353510520 is 2501535302.

It is a self number, because there is not a number n which added to its sum of digits gives 20353510520.

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, 9163010 + ... + 9165230.

It is an arithmetic number, because the mean of its divisors is an integer number (427157280).

Almost surely, 2^20353510520 is an apocalyptic number.

20353510520 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 20353510520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27338065920).

20353510520 is an abundant number, since it is smaller than the sum of its proper divisors (34322621320).

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

20353510520 is a wasteful number, since it uses less digits than its factorization.

20353510520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685 (or 3681 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The spelling of 20353510520 in words is "twenty billion, three hundred fifty-three million, five hundred ten thousand, five hundred twenty".