20810379 has 4 divisors (see below), whose sum is σ = 27747176. Its totient is φ = 13873584.

The previous prime is 20810369. The next prime is 20810399. The reversal of 20810379 is 97301802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20810379 - 2⁸ = 20810123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20810359) 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 in 3 ways as a sum of consecutive naturals, for example, 3468394 + ... + 3468399.

It is an arithmetic number, because the mean of its divisors is an integer number (6936794).

Almost surely, 2^20810379 is an apocalyptic number.

20810379 is a deficient number, since it is larger than the sum of its proper divisors (6936797).

20810379 is an equidigital number, since it uses as much as digits as its factorization.

20810379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936796.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20810379 is about 4561.8394316328. The cubic root of 20810379 is about 275.0595088847.

The spelling of 20810379 in words is "twenty million, eight hundred ten thousand, three hundred seventy-nine".