20049649 has 2 divisors, whose sum is σ = 20049650. Its totient is φ = 20049648.

The previous prime is 20049607. The next prime is 20049709. The reversal of 20049649 is 94694002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 970225 = 4368^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20049649 - 2²¹ = 17952497 is a prime.

It is a super-3 number, since 3×20049649³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20049049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10024824 + 10024825.

It is an arithmetic number, because the mean of its divisors is an integer number (10024825).

Almost surely, 2^20049649 is an apocalyptic number.

It is an amenable number.

20049649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20049649 is an equidigital number, since it uses as much as digits as its factorization.

20049649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20049649 is about 4477.6834412450. The cubic root of 20049649 is about 271.6661895852. Note that the first 3 decimals are identical.

The spelling of 20049649 in words is "twenty million, forty-nine thousand, six hundred forty-nine".