20837168449 has 2 divisors, whose sum is σ = 20837168450. Its totient is φ = 20837168448.

The previous prime is 20837168437. The next prime is 20837168467. The reversal of 20837168449 is 94486173802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13091936400 + 7745232049 = 114420^2 + 88007^2 .

It is a cyclic number.

It is not a de Polignac number, because 20837168449 - 2¹¹ = 20837166401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20837168396 and 20837168405.

It is not a weakly prime, because it can be changed into another prime (20837168419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418584224 + 10418584225.

It is an arithmetic number, because the mean of its divisors is an integer number (10418584225).

Almost surely, 2^20837168449 is an apocalyptic number.

It is an amenable number.

20837168449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20837168449 is an equidigital number, since it uses as much as digits as its factorization.

20837168449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 20837168449 in words is "twenty billion, eight hundred thirty-seven million, one hundred sixty-eight thousand, four hundred forty-nine".