20040401 has 6 divisors (see below), whose sum is σ = 20247570. Its totient is φ = 19835328.

The previous prime is 20040373. The next prime is 20040403. The reversal of 20040401 is 10404002.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 3066001 = 4120^2 + 1751^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20040401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20040403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9665 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (3374595).

Almost surely, 2^20040401 is an apocalyptic number.

It is an amenable number.

20040401 is a deficient number, since it is larger than the sum of its proper divisors (207169).

20040401 is an equidigital number, since it uses as much as digits as its factorization.

20040401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 1992 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20040401 is about 4476.6506452928. The cubic root of 20040401 is about 271.6244140359.

Adding to 20040401 its reverse (10404002), we get a palindrome (30444403).

The spelling of 20040401 in words is "twenty million, forty thousand, four hundred one".