20015000 has 40 divisors (see below), whose sum is σ = 46906860. Its totient is φ = 8004000.

The previous prime is 20014993. The next prime is 20015029. The reversal of 20015000 is 51002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2999 + ... + 7001.

Almost surely, 2^20015000 is an apocalyptic number.

20015000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23453430).

20015000 is an abundant number, since it is smaller than the sum of its proper divisors (26891860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20015000 is an equidigital number, since it uses as much as digits as its factorization.

20015000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029 (or 4010 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 20015000 is about 4473.8126916535. The cubic root of 20015000 is about 271.5096051419.

Adding to 20015000 its reverse (51002), we get a palindrome (20066002).

The spelling of 20015000 in words is "twenty million, fifteen thousand".