20408969 has 8 divisors (see below), whose sum is σ = 23556288. Its totient is φ = 17319600.

The previous prime is 20408957. The next prime is 20408987. The reversal of 20408969 is 96980402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20408969 - 2²⁴ = 3631753 is a prime.

It is a super-2 number, since 2×20408969² = 833052031285922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20408909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13727 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (2944536).

Almost surely, 2^20408969 is an apocalyptic number.

It is an amenable number.

20408969 is a deficient number, since it is larger than the sum of its proper divisors (3147319).

20408969 is a wasteful number, since it uses less digits than its factorization.

20408969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28975.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20408969 is about 4517.6286921348. The cubic root of 20408969 is about 273.2794796076.

The spelling of 20408969 in words is "twenty million, four hundred eight thousand, nine hundred sixty-nine".