20454100243 has 2 divisors, whose sum is σ = 20454100244. Its totient is φ = 20454100242.

The previous prime is 20454100237. The next prime is 20454100253. The reversal of 20454100243 is 34200145402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20454100243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20454100223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227050121 + 10227050122.

It is an arithmetic number, because the mean of its divisors is an integer number (10227050122).

Almost surely, 2^20454100243 is an apocalyptic number.

20454100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454100243 is an equidigital number, since it uses as much as digits as its factorization.

20454100243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20454100243 its reverse (34200145402), we get a palindrome (54654245645).

The spelling of 20454100243 in words is "twenty billion, four hundred fifty-four million, one hundred thousand, two hundred forty-three".