20115001 has 4 divisors (see below), whose sum is σ = 20763904.
Its totient is φ = 19466100.
The previous prime is 20114993. The next prime is 20115023. The reversal of 20115001 is 10051102.
Adding to 20115001 its reverse (10051102), we get a palindrome (30166103).
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 20115001 - 23 = 20114993 is a prime.
It is a super-2 number, since 2×201150012 = 809226530460002, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20115031) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324405 + ... + 324466.
It is an arithmetic number, because the mean of its divisors is an integer number (5190976).
Almost surely, 220115001 is an apocalyptic number.
It is an amenable number.
20115001 is a deficient number, since it is larger than the sum of its proper divisors (648903).
20115001 is an equidigital number, since it uses as much as digits as its factorization.
20115001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 648902.
The product of its (nonzero) digits is 10, while the sum is 10.
The square root of 20115001 is about 4484.9750278012.
The cubic root of 20115001 is about 271.9610355446.
The spelling of 20115001 in words is "twenty million, one hundred fifteen thousand, one".