20015244 has 54 divisors (see below), whose sum is σ = 52939796. Its totient is φ = 6375600.

The previous prime is 20015231. The next prime is 20015251. The reversal of 20015244 is 44251002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18519 + ... + 19569.

Almost surely, 2^20015244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26469898).

20015244 is an abundant number, since it is smaller than the sum of its proper divisors (32924552).

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

20015244 is a wasteful number, since it uses less digits than its factorization.

20015244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20015244 is about 4473.8399613755. The cubic root of 20015244 is about 271.5107084490.

Adding to 20015244 its reverse (44251002), we get a palindrome (64266246).

The spelling of 20015244 in words is "twenty million, fifteen thousand, two hundred forty-four".