20403454313525 has 6 divisors (see below), whose sum is σ = 25300283348802. Its totient is φ = 16322763450800.

The previous prime is 20403454313513. The next prime is 20403454313527. The reversal of 20403454313525 is 52531345430402.

It can be written as a sum of positive squares in 3 ways, for example, as 167914731076 + 20235539582449 = 409774^2 + 4498393^2 .

It is not a de Polignac number, because 20403454313525 - 2¹² = 20403454309429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403454313527) 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 5 ways as a sum of consecutive naturals, for example, 408069086246 + ... + 408069086295.

It is an arithmetic number, because the mean of its divisors is an integer number (4216713891467).

Almost surely, 2^{20403454313525} is an apocalyptic number.

20403454313525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20403454313525 is a deficient number, since it is larger than the sum of its proper divisors (4896829035277).

20403454313525 is an equidigital number, since it uses as much as digits as its factorization.

20403454313525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816138172551 (or 816138172546 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 41.

Adding to 20403454313525 its reverse (52531345430402), we get a palindrome (72934799743927).

The spelling of 20403454313525 in words is "twenty trillion, four hundred three billion, four hundred fifty-four million, three hundred thirteen thousand, five hundred twenty-five".