20353344440 has 128 divisors (see below), whose sum is σ = 53918161920. Its totient is φ = 6817036800.

The previous prime is 20353344439. The next prime is 20353344461. The reversal of 20353344440 is 4444335302.

It is a junction number, because it is equal to n+sod(n) for n = 20353344397 and 20353344406.

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, 2804897 + ... + 2812143.

It is an arithmetic number, because the mean of its divisors is an integer number (421235640).

Almost surely, 2^20353344440 is an apocalyptic number.

20353344440 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 20353344440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26959080960).

20353344440 is an abundant number, since it is smaller than the sum of its proper divisors (33564817480).

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

20353344440 is a wasteful number, since it uses less digits than its factorization.

20353344440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773 (or 7769 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 32.

Adding to 20353344440 its reverse (4444335302), we get a palindrome (24797679742).

The spelling of 20353344440 in words is "twenty billion, three hundred fifty-three million, three hundred forty-four thousand, four hundred forty".