20503403310400 has 84 divisors (see below), whose sum is σ = 51624470357152. Its totient is φ = 8010631964160.

The previous prime is 20503403310371. The next prime is 20503403310413. The reversal of 20503403310400 is 401330430502.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148938492 + ... + 149076091.

Almost surely, 2^{20503403310400} is an apocalyptic number.

20503403310400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20503403310400 is an abundant number, since it is smaller than the sum of its proper divisors (31121067046752).

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

20503403310400 is a wasteful number, since it uses less digits than its factorization.

20503403310400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298014648 (or 298014633 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20503403310400 its reverse (401330430502), we get a palindrome (20904733740902).

The spelling of 20503403310400 in words is "twenty trillion, five hundred three billion, four hundred three million, three hundred ten thousand, four hundred".