20503353520 has 40 divisors (see below), whose sum is σ = 51337245456. Its totient is φ = 7570468608.

The previous prime is 20503353499. The next prime is 20503353527. The reversal of 20503353520 is 2535330502.

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

It is not an unprimeable number, because it can be changed into a prime (20503353527) 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, 9856342 + ... + 9858421.

Almost surely, 2^20503353520 is an apocalyptic number.

20503353520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20503353520 is an abundant number, since it is smaller than the sum of its proper divisors (30833891936).

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

20503353520 is a wasteful number, since it uses less digits than its factorization.

20503353520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19714789 (or 19714783 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 28.

The spelling of 20503353520 in words is "twenty billion, five hundred three million, three hundred fifty-three thousand, five hundred twenty".