20552173440 has 64 divisors (see below), whose sum is σ = 65510058960. Its totient is φ = 5480579072.

The previous prime is 20552173429. The next prime is 20552173451. The reversal of 20552173440 is 4437125502.

It is an interprime number because it is at equal distance from previous prime (20552173429) and next prime (20552173451).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5350209 + ... + 5354048.

Almost surely, 2^20552173440 is an apocalyptic number.

20552173440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20552173440 is an abundant number, since it is smaller than the sum of its proper divisors (44957885520).

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

20552173440 is a wasteful number, since it uses less digits than its factorization.

20552173440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10704279 (or 10704267 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

Adding to 20552173440 its reverse (4437125502), we get a palindrome (24989298942).

The spelling of 20552173440 in words is "twenty billion, five hundred fifty-two million, one hundred seventy-three thousand, four hundred forty".