20442403 has 2 divisors, whose sum is σ = 20442404. Its totient is φ = 20442402.

The previous prime is 20442397. The next prime is 20442413. The reversal of 20442403 is 30424402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20442403 - 2¹⁷ = 20311331 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221201 + 10221202.

It is an arithmetic number, because the mean of its divisors is an integer number (10221202).

Almost surely, 2^20442403 is an apocalyptic number.

20442403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442403 is an equidigital number, since it uses as much as digits as its factorization.

20442403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20442403 is about 4521.3275705262. The cubic root of 20442403 is about 273.4286271276.

Adding to 20442403 its reverse (30424402), we get a palindrome (50866805).

The spelling of 20442403 in words is "twenty million, four hundred forty-two thousand, four hundred three".