20015018 has 16 divisors (see below), whose sum is σ = 33462720. Its totient is φ = 8922816.

The previous prime is 20014993. The next prime is 20015029. The reversal of 20015018 is 81051002.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 20014987 and 20015005.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14846 + ... + 16137.

It is an arithmetic number, because the mean of its divisors is an integer number (2091420).

Almost surely, 2^20015018 is an apocalyptic number.

20015018 is a deficient number, since it is larger than the sum of its proper divisors (13447702).

20015018 is a wasteful number, since it uses less digits than its factorization.

20015018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31021.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 20015018 is about 4473.8147033600. The cubic root of 20015018 is about 271.5096865337.

The spelling of 20015018 in words is "twenty million, fifteen thousand, eighteen".