20181245 has 32 divisors (see below), whose sum is σ = 29203200. Its totient is φ = 13095936.

The previous prime is 20181229. The next prime is 20181247. The reversal of 20181245 is 54218102.

It is not a de Polignac number, because 20181245 - 2⁴ = 20181229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20181245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59717 + ... + 60053.

It is an arithmetic number, because the mean of its divisors is an integer number (912600).

Almost surely, 2^20181245 is an apocalyptic number.

It is an amenable number.

20181245 is a deficient number, since it is larger than the sum of its proper divisors (9021955).

20181245 is a wasteful number, since it uses less digits than its factorization.

20181245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 20181245 is about 4492.3540599556. The cubic root of 20181245 is about 272.2592548691.

Adding to 20181245 its reverse (54218102), we get a palindrome (74399347).

The spelling of 20181245 in words is "twenty million, one hundred eighty-one thousand, two hundred forty-five".