15000020 has 48 divisors (see below), whose sum is σ = 36220800. Its totient is φ = 5111424.

The previous prime is 15000017. The next prime is 15000031. The reversal of 15000020 is 2000051.

15000020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 14999971 and 15000007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42806 + ... + 43154.

It is an arithmetic number, because the mean of its divisors is an integer number (754600).

Almost surely, 2^15000020 is an apocalyptic number.

15000020 is a gapful number since it is divisible by the number (10) 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 15000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18110400).

15000020 is an abundant number, since it is smaller than the sum of its proper divisors (21220780).

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

15000020 is a wasteful number, since it uses less digits than its factorization.

15000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

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

The square root of 15000020 is about 3872.9859281955. The cubic root of 15000020 is about 246.6213170424.

Adding to 15000020 its reverse (2000051), we get a palindrome (17000071).

The spelling of 15000020 in words is "fifteen million, twenty", and thus it is an aban number and an uban number.