20412649 has 2 divisors, whose sum is σ = 20412650. Its totient is φ = 20412648.

The previous prime is 20412647. The next prime is 20412671. The reversal of 20412649 is 94621402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 672400 = 4443^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412649 - 2¹ = 20412647 is a prime.

Together with 20412647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20412647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206324 + 10206325.

It is an arithmetic number, because the mean of its divisors is an integer number (10206325).

Almost surely, 2^20412649 is an apocalyptic number.

It is an amenable number.

20412649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412649 is an equidigital number, since it uses as much as digits as its factorization.

20412649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20412649 is about 4518.0359670990. The cubic root of 20412649 is about 273.2959038906.

The spelling of 20412649 in words is "twenty million, four hundred twelve thousand, six hundred forty-nine".