20015226 has 72 divisors (see below), whose sum is σ = 55059264. Its totient is φ = 5196240.

The previous prime is 20015207. The next prime is 20015231. The reversal of 20015226 is 62251002.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20015199 and 20015208.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8671 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (764712).

Almost surely, 2^20015226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27529632).

20015226 is an abundant number, since it is smaller than the sum of its proper divisors (35044038).

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

20015226 is a wasteful number, since it uses less digits than its factorization.

20015226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20015226 is about 4473.8379496803. The cubic root of 20015226 is about 271.5106270578.

Adding to 20015226 its reverse (62251002), we get a palindrome (82266228).

It can be divided in two parts, 2001 and 5226, that added together give a palindrome (7227).

The spelling of 20015226 in words is "twenty million, fifteen thousand, two hundred twenty-six".