20211245 has 4 divisors (see below), whose sum is σ = 24253500. Its totient is φ = 16168992.

The previous prime is 20211241. The next prime is 20211253. The reversal of 20211245 is 54211202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54211202 = 2 ⋅27105601.

It can be written as a sum of positive squares in 2 ways, for example, as 2208196 + 18003049 = 1486^2 + 4243^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211245 - 2² = 20211241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211241) 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, 2021120 + ... + 2021129.

It is an arithmetic number, because the mean of its divisors is an integer number (6063375).

Almost surely, 2^20211245 is an apocalyptic number.

It is an amenable number.

20211245 is a deficient number, since it is larger than the sum of its proper divisors (4042255).

20211245 is an equidigital number, since it uses as much as digits as its factorization.

20211245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042254.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20211245 is about 4495.6918266269. The cubic root of 20211245 is about 272.3940951423.

Adding to 20211245 its reverse (54211202), we get a palindrome (74422447).

The spelling of 20211245 in words is "twenty million, two hundred eleven thousand, two hundred forty-five".