20969429 has 4 divisors (see below), whose sum is σ = 22582476. Its totient is φ = 19356384.

The previous prime is 20969419. The next prime is 20969437. The reversal of 20969429 is 92496902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13140625 + 7828804 = 3625^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 20969429 - 2⁴ = 20969413 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 (20969419) 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 3 ways as a sum of consecutive naturals, for example, 806504 + ... + 806529.

It is an arithmetic number, because the mean of its divisors is an integer number (5645619).

Almost surely, 2^20969429 is an apocalyptic number.

It is an amenable number.

20969429 is a deficient number, since it is larger than the sum of its proper divisors (1613047).

20969429 is a wasteful number, since it uses less digits than its factorization.

20969429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613046.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 20969429 is about 4579.2389105614. The cubic root of 20969429 is about 275.7584747303.

The spelling of 20969429 in words is "twenty million, nine hundred sixty-nine thousand, four hundred twenty-nine".