20442401 has 4 divisors (see below), whose sum is σ = 23362752. Its totient is φ = 17522052.

The previous prime is 20442397. The next prime is 20442403. The reversal of 20442401 is 10424402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10424402 = 2 ⋅5212201.

It is a cyclic number.

It is not a de Polignac number, because 20442401 - 2² = 20442397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20442401.

It is not an unprimeable number, because it can be changed into a prime (20442403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460165 + ... + 1460178.

It is an arithmetic number, because the mean of its divisors is an integer number (5840688).

Almost surely, 2^20442401 is an apocalyptic number.

It is an amenable number.

20442401 is a deficient number, since it is larger than the sum of its proper divisors (2920351).

20442401 is an equidigital number, since it uses as much as digits as its factorization.

20442401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920350.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20442401 is about 4521.3273493522. The cubic root of 20442401 is about 273.4286182106.

Adding to 20442401 its reverse (10424402), we get a palindrome (30866803).

The spelling of 20442401 in words is "twenty million, four hundred forty-two thousand, four hundred one".