20249505 has 12 divisors (see below), whose sum is σ = 35099220. Its totient is φ = 10799712.

The previous prime is 20249503. The next prime is 20249519. The reversal of 20249505 is 50594202.

It can be written as a sum of positive squares in 2 ways, for example, as 15374241 + 4875264 = 3921^2 + 2208^2 .

It is not a de Polignac number, because 20249505 - 2¹ = 20249503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20249501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224950 + ... + 225039.

It is an arithmetic number, because the mean of its divisors is an integer number (2924935).

Almost surely, 2^20249505 is an apocalyptic number.

It is an amenable number.

20249505 is a deficient number, since it is larger than the sum of its proper divisors (14849715).

20249505 is a wasteful number, since it uses less digits than its factorization.

20249505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450000 (or 449997 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20249505 is about 4499.9449996639. The cubic root of 20249505 is about 272.5658679816.

The spelling of 20249505 in words is "twenty million, two hundred forty-nine thousand, five hundred five".