20969143 has 16 divisors (see below), whose sum is σ = 24071040. Its totient is φ = 18095616.

The previous prime is 20969129. The next prime is 20969147. The reversal of 20969143 is 34196902.

It is not a de Polignac number, because 20969143 - 2¹⁷ = 20838071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20969099 and 20969108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52621 + ... + 53017.

It is an arithmetic number, because the mean of its divisors is an integer number (1504440).

Almost surely, 2^20969143 is an apocalyptic number.

20969143 is a deficient number, since it is larger than the sum of its proper divisors (3101897).

20969143 is a wasteful number, since it uses less digits than its factorization.

20969143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20969143 is about 4579.2076825582. The cubic root of 20969143 is about 275.7572210436.

It can be divided in two parts, 20969 and 143, that added together give a palindrome (21112).

The spelling of 20969143 in words is "twenty million, nine hundred sixty-nine thousand, one hundred forty-three".