20508379 has 2 divisors, whose sum is σ = 20508380. Its totient is φ = 20508378.

The previous prime is 20508349. The next prime is 20508413. The reversal of 20508379 is 97380502.

It is an a-pointer prime, because the next prime (20508413) can be obtained adding 20508379 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20508379 - 2⁷ = 20508251 is a prime.

It is not a weakly prime, because it can be changed into another prime (20508349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254189 + 10254190.

It is an arithmetic number, because the mean of its divisors is an integer number (10254190).

Almost surely, 2^20508379 is an apocalyptic number.

20508379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508379 is an equidigital number, since it uses as much as digits as its factorization.

20508379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20508379 is about 4528.6177802946. The cubic root of 20508379 is about 273.7224665983.

The spelling of 20508379 in words is "twenty million, five hundred eight thousand, three hundred seventy-nine".