20959387 has 2 divisors, whose sum is σ = 20959388. Its totient is φ = 20959386.

The previous prime is 20959381. The next prime is 20959397. The reversal of 20959387 is 78395902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20959387 - 2¹⁹ = 20435099 is a prime.

It is not a weakly prime, because it can be changed into another prime (20959381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479693 + 10479694.

It is an arithmetic number, because the mean of its divisors is an integer number (10479694).

Almost surely, 2^20959387 is an apocalyptic number.

20959387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20959387 is an equidigital number, since it uses as much as digits as its factorization.

20959387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20959387 is about 4578.1423088410. The cubic root of 20959387 is about 275.7144485949.

The spelling of 20959387 in words is "twenty million, nine hundred fifty-nine thousand, three hundred eighty-seven".