20552363440 has 40 divisors (see below), whose sum is σ = 54610567200. Its totient is φ = 7046524416.

The previous prime is 20552363413. The next prime is 20552363443. The reversal of 20552363440 is 4436325502.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20552363396 and 20552363405.

It is not an unprimeable number, because it can be changed into a prime (20552363443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18349765 + ... + 18350884.

It is an arithmetic number, because the mean of its divisors is an integer number (1365264180).

Almost surely, 2^20552363440 is an apocalyptic number.

20552363440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20552363440 is an abundant number, since it is smaller than the sum of its proper divisors (34058203760).

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

20552363440 is a wasteful number, since it uses less digits than its factorization.

20552363440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36700669 (or 36700663 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 20552363440 its reverse (4436325502), we get a palindrome (24988688942).

The spelling of 20552363440 in words is "twenty billion, five hundred fifty-two million, three hundred sixty-three thousand, four hundred forty".