20415001 has 4 divisors (see below), whose sum is σ = 20430900. Its totient is φ = 20399104.

The previous prime is 20414993. The next prime is 20415013. The reversal of 20415001 is 10051402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10051402 = 2 ⋅5025701.

It can be written as a sum of positive squares in 2 ways, for example, as 1265625 + 19149376 = 1125^2 + 4376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415001 - 2³ = 20414993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5836 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (5107725).

Almost surely, 2^20415001 is an apocalyptic number.

It is an amenable number.

20415001 is a deficient number, since it is larger than the sum of its proper divisors (15899).

20415001 is a wasteful number, since it uses less digits than its factorization.

20415001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15898.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20415001 is about 4518.2962496941. The cubic root of 20415001 is about 273.3064001157.

Adding to 20415001 its reverse (10051402), we get a palindrome (30466403).

The spelling of 20415001 in words is "twenty million, four hundred fifteen thousand, one".