20944135 has 4 divisors (see below), whose sum is σ = 25132968. Its totient is φ = 16755304.

The previous prime is 20944129. The next prime is 20944141. The reversal of 20944135 is 53144902.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20944129) and next prime (20944141).

It is a cyclic number.

It is not a de Polignac number, because 20944135 - 2¹⁷ = 20813063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094409 + ... + 2094418.

It is an arithmetic number, because the mean of its divisors is an integer number (6283242).

Almost surely, 2^20944135 is an apocalyptic number.

20944135 is a deficient number, since it is larger than the sum of its proper divisors (4188833).

20944135 is an equidigital number, since it uses as much as digits as its factorization.

20944135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188832.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20944135 is about 4576.4762645511. The cubic root of 20944135 is about 275.6475538711.

It can be divided in two parts, 209 and 44135, that added together give a palindrome (44344).

The spelling of 20944135 in words is "twenty million, nine hundred forty-four thousand, one hundred thirty-five".