20801579 has 2 divisors, whose sum is σ = 20801580. Its totient is φ = 20801578.

The previous prime is 20801567. The next prime is 20801593. The reversal of 20801579 is 97510802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20801579 - 2¹⁶ = 20736043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20801479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10400789 + 10400790.

It is an arithmetic number, because the mean of its divisors is an integer number (10400790).

Almost surely, 2^20801579 is an apocalyptic number.

20801579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20801579 is an equidigital number, since it uses as much as digits as its factorization.

20801579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20801579 is about 4560.8748064379. The cubic root of 20801579 is about 275.0207323212.

The spelling of 20801579 in words is "twenty million, eight hundred one thousand, five hundred seventy-nine".