20535555424 has 12 divisors (see below), whose sum is σ = 40429374804. Its totient is φ = 10267777696.

The previous prime is 20535555421. The next prime is 20535555437. The reversal of 20535555424 is 42455553502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535555421) 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 as a sum of consecutive naturals, namely, 320868022 + ... + 320868085.

It is an arithmetic number, because the mean of its divisors is an integer number (3369114567).

Almost surely, 2^20535555424 is an apocalyptic number.

It is an amenable number.

20535555424 is a deficient number, since it is larger than the sum of its proper divisors (19893819380).

20535555424 is an equidigital number, since it uses as much as digits as its factorization.

20535555424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641736117 (or 641736109 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 40.

The spelling of 20535555424 in words is "twenty billion, five hundred thirty-five million, five hundred fifty-five thousand, four hundred twenty-four".