20403513204451 has 16 divisors (see below), whose sum is σ = 22567580124544. Its totient is φ = 18324415880064.

The previous prime is 20403513204427. The next prime is 20403513204461. The reversal of 20403513204451 is 15440231530402.

It is a cyclic number.

It is not a de Polignac number, because 20403513204451 - 2¹¹ = 20403513202403 is a prime.

It is a super-2 number, since 2×20403513204451² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20403513204461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15248806 + ... + 16532788.

It is an arithmetic number, because the mean of its divisors is an integer number (1410473757784).

Almost surely, 2^{20403513204451} is an apocalyptic number.

20403513204451 is a deficient number, since it is larger than the sum of its proper divisors (2164066920093).

20403513204451 is a wasteful number, since it uses less digits than its factorization.

20403513204451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317070.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 20403513204451 its reverse (15440231530402), we get a palindrome (35843744734853).

The spelling of 20403513204451 in words is "twenty trillion, four hundred three billion, five hundred thirteen million, two hundred four thousand, four hundred fifty-one".