20444215 has 16 divisors (see below), whose sum is σ = 26868096. Its totient is φ = 14810400.

The previous prime is 20444213. The next prime is 20444227. The reversal of 20444215 is 51244402.

It is a happy number.

It is not a de Polignac number, because 20444215 - 2¹ = 20444213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444213) 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, 17644 + ... + 18766.

It is an arithmetic number, because the mean of its divisors is an integer number (1679256).

Almost surely, 2^20444215 is an apocalyptic number.

20444215 is a deficient number, since it is larger than the sum of its proper divisors (6423881).

20444215 is a wasteful number, since it uses less digits than its factorization.

20444215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20444215 is about 4521.5279497090. The cubic root of 20444215 is about 273.4367057283.

Adding to 20444215 its reverse (51244402), we get a palindrome (71688617).

The spelling of 20444215 in words is "twenty million, four hundred forty-four thousand, two hundred fifteen".