20015011 has 4 divisors (see below), whose sum is σ = 20503224. Its totient is φ = 19526800.

The previous prime is 20014993. The next prime is 20015029. The reversal of 20015011 is 11051002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11051002 = 2 ⋅5525501.

It is an interprime number because it is at equal distance from previous prime (20014993) and next prime (20015029).

It is a cyclic number.

It is not a de Polignac number, because 20015011 - 2⁵ = 20014979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015041) 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, 244045 + ... + 244126.

It is an arithmetic number, because the mean of its divisors is an integer number (5125806).

Almost surely, 2^20015011 is an apocalyptic number.

20015011 is a deficient number, since it is larger than the sum of its proper divisors (488213).

20015011 is an equidigital number, since it uses as much as digits as its factorization.

20015011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488212.

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

The square root of 20015011 is about 4473.8139210298. The cubic root of 20015011 is about 271.5096548813.

Adding to 20015011 its reverse (11051002), we get a palindrome (31066013).

The spelling of 20015011 in words is "twenty million, fifteen thousand, eleven".