20047649 has 2 divisors, whose sum is σ = 20047650. Its totient is φ = 20047648.

The previous prime is 20047639. The next prime is 20047663. The reversal of 20047649 is 94674002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12730624 + 7317025 = 3568^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 20047649 - 2⁴ = 20047633 is a prime.

It is not a weakly prime, because it can be changed into another prime (20047609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023824 + 10023825.

It is an arithmetic number, because the mean of its divisors is an integer number (10023825).

Almost surely, 2^20047649 is an apocalyptic number.

It is an amenable number.

20047649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20047649 is an equidigital number, since it uses as much as digits as its factorization.

20047649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20047649 is about 4477.4601059083. The cubic root of 20047649 is about 271.6571561694.

The spelling of 20047649 in words is "twenty million, forty-seven thousand, six hundred forty-nine".