20311245 has 12 divisors (see below), whose sum is σ = 35206236. Its totient is φ = 10832640.

The previous prime is 20311211. The next prime is 20311273. The reversal of 20311245 is 54211302.

It can be written as a sum of positive squares in 2 ways, for example, as 12257001 + 8054244 = 3501^2 + 2838^2 .

It is not a de Polignac number, because 20311245 - 2¹⁴ = 20294861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225636 + ... + 225725.

It is an arithmetic number, because the mean of its divisors is an integer number (2933853).

Almost surely, 2^20311245 is an apocalyptic number.

It is an amenable number.

20311245 is a deficient number, since it is larger than the sum of its proper divisors (14894991).

20311245 is a wasteful number, since it uses less digits than its factorization.

20311245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451372 (or 451369 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20311245 is about 4506.7998624301. The cubic root of 20311245 is about 272.8426013754.

Adding to 20311245 its reverse (54211302), we get a palindrome (74522547).

The spelling of 20311245 in words is "twenty million, three hundred eleven thousand, two hundred forty-five".