20641339 has 2 divisors, whose sum is σ = 20641340. Its totient is φ = 20641338.

The previous prime is 20641307. The next prime is 20641343. The reversal of 20641339 is 93314602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20641339 - 2⁵ = 20641307 is a prime.

It is not a weakly prime, because it can be changed into another prime (20641399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320669 + 10320670.

It is an arithmetic number, because the mean of its divisors is an integer number (10320670).

Almost surely, 2^20641339 is an apocalyptic number.

20641339 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641339 is an equidigital number, since it uses as much as digits as its factorization.

20641339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20641339 is about 4543.2740397207. The cubic root of 20641339 is about 274.3127256824.

It can be divided in two parts, 2064 and 1339, that added together give a triangular number (3403 = T₈₂).

The spelling of 20641339 in words is "twenty million, six hundred forty-one thousand, three hundred thirty-nine".