20001115 has 8 divisors (see below), whose sum is σ = 24078960. Its totient is φ = 15949152.

The previous prime is 20001083. The next prime is 20001139. The reversal of 20001115 is 51110002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20001115 - 2⁵ = 20001083 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4725 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (3009870).

Almost surely, 2^20001115 is an apocalyptic number.

20001115 is a deficient number, since it is larger than the sum of its proper divisors (4077845).

20001115 is a wasteful number, since it uses less digits than its factorization.

20001115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12941.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 20001115 is about 4472.2606140519. The cubic root of 20001115 is about 271.4468058585.

Adding to 20001115 its reverse (51110002), we get a palindrome (71111117).

The spelling of 20001115 in words is "twenty million, one thousand, one hundred fifteen".