20929199 has 8 divisors (see below), whose sum is σ = 21273120. Its totient is φ = 20588256.

The previous prime is 20929177. The next prime is 20929253. The reversal of 20929199 is 99192902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20929199 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 (20929109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16502 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (2659140).

Almost surely, 2^20929199 is an apocalyptic number.

20929199 is a deficient number, since it is larger than the sum of its proper divisors (343921).

20929199 is a wasteful number, since it uses less digits than its factorization.

20929199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 20929199 is about 4574.8441503509. The cubic root of 20929199 is about 275.5820136307.

The spelling of 20929199 in words is "twenty million, nine hundred twenty-nine thousand, one hundred ninety-nine".