20523379 has 2 divisors, whose sum is σ = 20523380. Its totient is φ = 20523378.

The previous prime is 20523361. The next prime is 20523407. The reversal of 20523379 is 97332502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20523379 - 2⁹ = 20522867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20523379.

It is not a weakly prime, because it can be changed into another prime (20523479) 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, 10261689 + 10261690.

It is an arithmetic number, because the mean of its divisors is an integer number (10261690).

Almost surely, 2^20523379 is an apocalyptic number.

20523379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523379 is an equidigital number, since it uses as much as digits as its factorization.

20523379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 20523379 is about 4530.2736120460. The cubic root of 20523379 is about 273.7891846357.

It can be divided in two parts, 20523 and 379, that added together give a palindrome (20902).

The spelling of 20523379 in words is "twenty million, five hundred twenty-three thousand, three hundred seventy-nine".