20489875249 has 2 divisors, whose sum is σ = 20489875250. Its totient is φ = 20489875248.

The previous prime is 20489875183. The next prime is 20489875297. The reversal of 20489875249 is 94257898402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19921911025 + 567964224 = 141145^2 + 23832^2 .

It is a cyclic number.

It is not a de Polignac number, because 20489875249 - 2¹⁵ = 20489842481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20489875193 and 20489875202.

It is not a weakly prime, because it can be changed into another prime (20489875349) by changing a digit.

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 as a sum of consecutive naturals, namely, 10244937624 + 10244937625.

It is an arithmetic number, because the mean of its divisors is an integer number (10244937625).

Almost surely, 2^20489875249 is an apocalyptic number.

It is an amenable number.

20489875249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489875249 is an equidigital number, since it uses as much as digits as its factorization.

20489875249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 20489875249 in words is "twenty billion, four hundred eighty-nine million, eight hundred seventy-five thousand, two hundred forty-nine".