20120249 has 4 divisors (see below), whose sum is σ = 20206836. Its totient is φ = 20033664.

The previous prime is 20120237. The next prime is 20120251. The reversal of 20120249 is 94202102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94202102 = 2 ⋅47101051.

It can be written as a sum of positive squares in 2 ways, for example, as 12475024 + 7645225 = 3532^2 + 2765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120249.

It is not an unprimeable number, because it can be changed into a prime (20125249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42944 + ... + 43409.

It is an arithmetic number, because the mean of its divisors is an integer number (5051709).

Almost surely, 2^20120249 is an apocalyptic number.

It is an amenable number.

20120249 is a deficient number, since it is larger than the sum of its proper divisors (86587).

20120249 is an equidigital number, since it uses as much as digits as its factorization.

20120249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86586.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20120249 is about 4485.5600542184. The cubic root of 20120249 is about 271.9846850157.

The spelling of 20120249 in words is "twenty million, one hundred twenty thousand, two hundred forty-nine".