20520044240 has 40 divisors (see below), whose sum is σ = 48517742880. Its totient is φ = 8068896896.

The previous prime is 20520044221. The next prime is 20520044249. The reversal of 20520044240 is 4244002502.

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

It is a super-2 number, since 2×20520044240² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520044249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2169014 + ... + 2178453.

It is an arithmetic number, because the mean of its divisors is an integer number (1212943572).

Almost surely, 2^20520044240 is an apocalyptic number.

20520044240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520044240 is an abundant number, since it is smaller than the sum of its proper divisors (27997698640).

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

20520044240 is a wasteful number, since it uses less digits than its factorization.

20520044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347539 (or 4347533 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

Adding to 20520044240 its reverse (4244002502), we get a palindrome (24764046742).

The spelling of 20520044240 in words is "twenty billion, five hundred twenty million, forty-four thousand, two hundred forty".