20111249 has 4 divisors (see below), whose sum is σ = 20129460. Its totient is φ = 20093040.

The previous prime is 20111243. The next prime is 20111257. The reversal of 20111249 is 94211102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 2739025 = 4168^2 + 1655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111249 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 20111249.

It is not an unprimeable number, because it can be changed into a prime (20111243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7334 + ... + 9695.

It is an arithmetic number, because the mean of its divisors is an integer number (5032365).

Almost surely, 2^20111249 is an apocalyptic number.

It is an amenable number.

20111249 is a deficient number, since it is larger than the sum of its proper divisors (18211).

20111249 is a wasteful number, since it uses less digits than its factorization.

20111249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18210.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20111249 is about 4484.5567227988. The cubic root of 20111249 is about 271.9441250929.

The spelling of 20111249 in words is "twenty million, one hundred eleven thousand, two hundred forty-nine".