20440379 has 2 divisors, whose sum is σ = 20440380. Its totient is φ = 20440378.

The previous prime is 20440369. The next prime is 20440397. The reversal of 20440379 is 97304402.

Together with next prime (20440397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20440379 - 2²⁰ = 19391803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20440309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220189 + 10220190.

It is an arithmetic number, because the mean of its divisors is an integer number (10220190).

Almost surely, 2^20440379 is an apocalyptic number.

20440379 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440379 is an equidigital number, since it uses as much as digits as its factorization.

20440379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20440379 is about 4521.1037369209. The cubic root of 20440379 is about 273.4196027840.

The spelling of 20440379 in words is "twenty million, four hundred forty thousand, three hundred seventy-nine".