20405001 has 8 divisors (see below), whose sum is σ = 27227584. Its totient is φ = 13592880.

The previous prime is 20404999. The next prime is 20405027. The reversal of 20405001 is 10050402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20405001 - 2¹ = 20404999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20405041) 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 7 ways as a sum of consecutive naturals, for example, 5916 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (3403448).

Almost surely, 2^20405001 is an apocalyptic number.

It is an amenable number.

20405001 is a deficient number, since it is larger than the sum of its proper divisors (6822583).

20405001 is a wasteful number, since it uses less digits than its factorization.

20405001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20405001 is about 4517.1895023344. The cubic root of 20405001 is about 273.2617677336.

Adding to 20405001 its reverse (10050402), we get a palindrome (30455403).

The spelling of 20405001 in words is "twenty million, four hundred five thousand, one".