20379649 has 2 divisors, whose sum is σ = 20379650. Its totient is φ = 20379648.

The previous prime is 20379641. The next prime is 20379691. The reversal of 20379649 is 94697302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 3920400 = 4057^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20379649 - 2³ = 20379641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20379641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189824 + 10189825.

It is an arithmetic number, because the mean of its divisors is an integer number (10189825).

Almost surely, 2^20379649 is an apocalyptic number.

It is an amenable number.

20379649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20379649 is an equidigital number, since it uses as much as digits as its factorization.

20379649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 20379649 is about 4514.3824605365. The cubic root of 20379649 is about 273.1485503347.

The spelling of 20379649 in words is "twenty million, three hundred seventy-nine thousand, six hundred forty-nine".