20042401 has 4 divisors (see below), whose sum is σ = 20102212. Its totient is φ = 19982592.

The previous prime is 20042389. The next prime is 20042413. The reversal of 20042401 is 10424002.

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

It is an interprime number because it is at equal distance from previous prime (20042389) and next prime (20042413).

It can be written as a sum of positive squares in 2 ways, for example, as 9486400 + 10556001 = 3080^2 + 3249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042401 - 2⁷ = 20042273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29400 + ... + 30073.

It is an arithmetic number, because the mean of its divisors is an integer number (5025553).

Almost surely, 2^20042401 is an apocalyptic number.

It is an amenable number.

20042401 is a deficient number, since it is larger than the sum of its proper divisors (59811).

20042401 is an equidigital number, since it uses as much as digits as its factorization.

20042401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59810.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20042401 is about 4476.8740210106. The cubic root of 20042401 is about 271.6334496295.

Adding to 20042401 its reverse (10424002), we get a palindrome (30466403).

The spelling of 20042401 in words is "twenty million, forty-two thousand, four hundred one".