20403453481 has 2 divisors, whose sum is σ = 20403453482. Its totient is φ = 20403453480.

The previous prime is 20403453403. The next prime is 20403453541. The reversal of 20403453481 is 18435430402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11126874256 + 9276579225 = 105484^2 + 96315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403453481 - 2¹⁹ = 20402929193 is a prime.

It is a super-2 number, since 2×20403453481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20400453481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201726740 + 10201726741.

It is an arithmetic number, because the mean of its divisors is an integer number (10201726741).

Almost surely, 2^20403453481 is an apocalyptic number.

It is an amenable number.

20403453481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403453481 is an equidigital number, since it uses as much as digits as its factorization.

20403453481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 20403453481 its reverse (18435430402), we get a palindrome (38838883883).

The spelling of 20403453481 in words is "twenty billion, four hundred three million, four hundred fifty-three thousand, four hundred eighty-one".