20782849 has 2 divisors, whose sum is σ = 20782850. Its totient is φ = 20782848.

The previous prime is 20782829. The next prime is 20782877. The reversal of 20782849 is 94828702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 2873025 = 4232^2 + 1695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20782849 - 2¹⁷ = 20651777 is a prime.

It is not a weakly prime, because it can be changed into another prime (20782829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391424 + 10391425.

It is an arithmetic number, because the mean of its divisors is an integer number (10391425).

Almost surely, 2^20782849 is an apocalyptic number.

It is an amenable number.

20782849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20782849 is an equidigital number, since it uses as much as digits as its factorization.

20782849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 20782849 is about 4558.8210098665. The cubic root of 20782849 is about 274.9381635070.

The spelling of 20782849 in words is "twenty million, seven hundred eighty-two thousand, eight hundred forty-nine".