20305001 has 4 divisors (see below), whose sum is σ = 20359812. Its totient is φ = 20250192.

The previous prime is 20304997. The next prime is 20305003. The reversal of 20305001 is 10050302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10050302 = 2 ⋅5025151.

It can be written as a sum of positive squares in 2 ways, for example, as 6250000 + 14055001 = 2500^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305001 - 2² = 20304997 is a prime.

It is a super-3 number, since 3×20305001³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305003) 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 3 ways as a sum of consecutive naturals, for example, 26846 + ... + 27591.

It is an arithmetic number, because the mean of its divisors is an integer number (5089953).

Almost surely, 2^20305001 is an apocalyptic number.

It is an amenable number.

20305001 is a deficient number, since it is larger than the sum of its proper divisors (54811).

20305001 is an equidigital number, since it uses as much as digits as its factorization.

20305001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54810.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 20305001 is about 4506.1070781773. The cubic root of 20305001 is about 272.8146397905.

Adding to 20305001 its reverse (10050302), we get a palindrome (30355303).

The spelling of 20305001 in words is "twenty million, three hundred five thousand, one".