13020645 has 64 divisors (see below), whose sum is σ = 24551424. Its totient is φ = 5829120.

The previous prime is 13020641. The next prime is 13020647. The reversal of 13020645 is 54602031.

It is a happy number.

It is not a de Polignac number, because 13020645 - 2² = 13020641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 178329 + ... + 178401.

It is an arithmetic number, because the mean of its divisors is an integer number (383616).

Almost surely, 2^13020645 is an apocalyptic number.

13020645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13020645 is a deficient number, since it is larger than the sum of its proper divisors (11530779).

13020645 is a wasteful number, since it uses less digits than its factorization.

13020645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 13020645 is about 3608.4130861086. The cubic root of 13020645 is about 235.2578729527.

Adding to 13020645 its reverse (54602031), we get a palindrome (67622676).

The spelling of 13020645 in words is "thirteen million, twenty thousand, six hundred forty-five".