20841015 has 16 divisors (see below), whose sum is σ = 35911008. Its totient is φ = 10260096.

The previous prime is 20841011. The next prime is 20841049. The reversal of 20841015 is 51014802.

It is not a de Polignac number, because 20841015 - 2² = 20841011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20840982 and 20841000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20841011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53244 + ... + 53633.

It is an arithmetic number, because the mean of its divisors is an integer number (2244438).

Almost surely, 2^20841015 is an apocalyptic number.

20841015 is a deficient number, since it is larger than the sum of its proper divisors (15069993).

20841015 is a wasteful number, since it uses less digits than its factorization.

20841015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106898.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20841015 is about 4565.1960527452. The cubic root of 20841015 is about 275.1944189915.

Adding to 20841015 its reverse (51014802), we get a palindrome (71855817).

The spelling of 20841015 in words is "twenty million, eight hundred forty-one thousand, fifteen".