20442479 has 2 divisors, whose sum is σ = 20442480. Its totient is φ = 20442478.

The previous prime is 20442473. The next prime is 20442511. The reversal of 20442479 is 97424402.

It is an a-pointer prime, because the next prime (20442511) can be obtained adding 20442479 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20442473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221239 + 10221240.

It is an arithmetic number, because the mean of its divisors is an integer number (10221240).

Almost surely, 2^20442479 is an apocalyptic number.

20442479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442479 is an equidigital number, since it uses as much as digits as its factorization.

20442479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20442479 is about 4521.3359751295. The cubic root of 20442479 is about 273.4289659747.

The spelling of 20442479 in words is "twenty million, four hundred forty-two thousand, four hundred seventy-nine".