20929249 has 6 divisors (see below), whose sum is σ = 23005010. Its totient is φ = 19026480.

The previous prime is 20929177. The next prime is 20929253. The reversal of 20929249 is 94292902.

It can be written as a sum of positive squares in only one way, i.e., 11778624 + 9150625 = 3432^2 + 3025^2 .

It is not a de Polignac number, because 20929249 - 2⁷ = 20929121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20929049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86364 + ... + 86605.

Almost surely, 2^20929249 is an apocalyptic number.

It is an amenable number.

20929249 is a deficient number, since it is larger than the sum of its proper divisors (2075761).

20929249 is a wasteful number, since it uses less digits than its factorization.

20929249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172991 (or 172980 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20929249 is about 4574.8496150147. The cubic root of 20929249 is about 275.5822330863.

The spelling of 20929249 in words is "twenty million, nine hundred twenty-nine thousand, two hundred forty-nine".