20020401 has 6 divisors (see below), whose sum is σ = 28918370. Its totient is φ = 13346928.

The previous prime is 20020387. The next prime is 20020421. The reversal of 20020401 is 10402002.

It can be written as a sum of positive squares in only one way, i.e., 15610401 + 4410000 = 3951^2 + 2100^2 .

It is not a de Polignac number, because 20020401 - 2¹⁵ = 19987633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2224489 = 20020401 / (2 + 0 + 0 + 2 + 0 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112236 + ... + 1112253.

Almost surely, 2^20020401 is an apocalyptic number.

It is an amenable number.

20020401 is a deficient number, since it is larger than the sum of its proper divisors (8897969).

20020401 is a wasteful number, since it uses less digits than its factorization.

20020401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224495 (or 2224492 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20020401 is about 4474.4162747782. The cubic root of 20020401 is about 271.5340250185.

Adding to 20020401 its reverse (10402002), we get a palindrome (30422403).

The spelling of 20020401 in words is "twenty million, twenty thousand, four hundred one".