20172379 has 2 divisors, whose sum is σ = 20172380. Its totient is φ = 20172378.

The previous prime is 20172377. The next prime is 20172401. The reversal of 20172379 is 97327102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20172379 - 2¹ = 20172377 is a prime.

Together with 20172377, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20172379.

It is not a weakly prime, because it can be changed into another prime (20172377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086189 + 10086190.

It is an arithmetic number, because the mean of its divisors is an integer number (10086190).

Almost surely, 2^20172379 is an apocalyptic number.

20172379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20172379 is an equidigital number, since it uses as much as digits as its factorization.

20172379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20172379 is about 4491.3671637932. The cubic root of 20172379 is about 272.2193794943.

The spelling of 20172379 in words is "twenty million, one hundred seventy-two thousand, three hundred seventy-nine".