20015020 has 24 divisors (see below), whose sum is σ = 42122304. Its totient is φ = 7988736.

The previous prime is 20014993. The next prime is 20015029. The reversal of 20015020 is 2051002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20014988 and 20015006.

It is not an unprimeable number, because it can be changed into a prime (20015029) 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 7 ways as a sum of consecutive naturals, for example, 12717 + ... + 14203.

It is an arithmetic number, because the mean of its divisors is an integer number (1755096).

Almost surely, 2^20015020 is an apocalyptic number.

20015020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015020 is an abundant number, since it is smaller than the sum of its proper divisors (22107284).

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

20015020 is a wasteful number, since it uses less digits than its factorization.

20015020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20015020 is about 4473.8149268829. The cubic root of 20015020 is about 271.5096955772.

Adding to 20015020 its reverse (2051002), we get a palindrome (22066022).

It can be divided in two parts, 2001 and 5020, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 20015020 in words is "twenty million, fifteen thousand, twenty".