20620249 has 8 divisors (see below), whose sum is σ = 22253000. Its totient is φ = 18994176.

The previous prime is 20620241. The next prime is 20620283. The reversal of 20620249 is 94202602.

It can be written as a sum of positive squares in 4 ways, for example, as 2190400 + 18429849 = 1480^2 + 4293^2 .

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 20620249 - 2³ = 20620241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20620241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6127 + ... + 8875.

It is an arithmetic number, because the mean of its divisors is an integer number (2781625).

Almost surely, 2^20620249 is an apocalyptic number.

It is an amenable number.

20620249 is a deficient number, since it is larger than the sum of its proper divisors (1632751).

20620249 is a wasteful number, since it uses less digits than its factorization.

20620249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20620249 is about 4540.9524331356. The cubic root of 20620249 is about 274.2192687796.

The spelling of 20620249 in words is "twenty million, six hundred twenty thousand, two hundred forty-nine".