20838215 has 16 divisors (see below), whose sum is σ = 26050368. Its totient is φ = 15987456.

The previous prime is 20838203. The next prime is 20838221. The reversal of 20838215 is 51283802.

It is a cyclic number.

It is not a de Polignac number, because 20838215 - 2⁴ = 20838199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12734 + ... + 14276.

It is an arithmetic number, because the mean of its divisors is an integer number (1628148).

Almost surely, 2^20838215 is an apocalyptic number.

20838215 is a deficient number, since it is larger than the sum of its proper divisors (5212153).

20838215 is a wasteful number, since it uses less digits than its factorization.

20838215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20838215 is about 4564.8893743441. The cubic root of 20838215 is about 275.1820942737.

The spelling of 20838215 in words is "twenty million, eight hundred thirty-eight thousand, two hundred fifteen".