20844969 has 16 divisors (see below), whose sum is σ = 29123712. Its totient is φ = 13236608.

The previous prime is 20844959. The next prime is 20844977. The reversal of 20844969 is 96944802.

It is a cyclic number.

It is not a de Polignac number, because 20844969 - 2⁵ = 20844937 is a prime.

It is a super-2 number, since 2×20844969² = 869025465221922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20844969.

It is not an unprimeable number, because it can be changed into a prime (20844959) 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, 21397 + ... + 22349.

It is an arithmetic number, because the mean of its divisors is an integer number (1820232).

Almost surely, 2^20844969 is an apocalyptic number.

It is an amenable number.

20844969 is a deficient number, since it is larger than the sum of its proper divisors (8278743).

20844969 is a wasteful number, since it uses less digits than its factorization.

20844969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 20844969 is about 4565.6290913739. The cubic root of 20844969 is about 275.2118213737.

The spelling of 20844969 in words is "twenty million, eight hundred forty-four thousand, nine hundred sixty-nine".