20485469 has 2 divisors, whose sum is σ = 20485470. Its totient is φ = 20485468.

The previous prime is 20485463. The next prime is 20485483. The reversal of 20485469 is 96458402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 9229444 = 3355^2 + 3038^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20485469 is a prime.

It is a super-2 number, since 2×20485469² = 839308880299922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20485463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242734 + 10242735.

It is an arithmetic number, because the mean of its divisors is an integer number (10242735).

Almost surely, 2^20485469 is an apocalyptic number.

It is an amenable number.

20485469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20485469 is an equidigital number, since it uses as much as digits as its factorization.

20485469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20485469 is about 4526.0876041014. The cubic root of 20485469 is about 273.6205030988.

The spelling of 20485469 in words is "twenty million, four hundred eighty-five thousand, four hundred sixty-nine".