20180401 has 4 divisors (see below), whose sum is σ = 20464704. Its totient is φ = 19896100.

The previous prime is 20180399. The next prime is 20180441. The reversal of 20180401 is 10408102.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 20180401 - 2¹ = 20180399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20180441) 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, 142045 + ... + 142186.

It is an arithmetic number, because the mean of its divisors is an integer number (5116176).

Almost surely, 2^20180401 is an apocalyptic number.

It is an amenable number.

20180401 is a deficient number, since it is larger than the sum of its proper divisors (284303).

20180401 is an equidigital number, since it uses as much as digits as its factorization.

20180401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284302.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20180401 is about 4492.2601215869. The cubic root of 20180401 is about 272.2554594307.

Adding to 20180401 its reverse (10408102), we get a palindrome (30588503).

The spelling of 20180401 in words is "twenty million, one hundred eighty thousand, four hundred one".