20613145 has 8 divisors (see below), whose sum is σ = 28269504. Its totient is φ = 14134704.

The previous prime is 20613139. The next prime is 20613149. The reversal of 20613145 is 54131602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20613145 - 2²¹ = 18515993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20613149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294439 + ... + 294508.

It is an arithmetic number, because the mean of its divisors is an integer number (3533688).

Almost surely, 2^20613145 is an apocalyptic number.

It is an amenable number.

20613145 is a deficient number, since it is larger than the sum of its proper divisors (7656359).

20613145 is an equidigital number, since it uses as much as digits as its factorization.

20613145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588959.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20613145 is about 4540.1701509965. The cubic root of 20613145 is about 274.1877742126.

Adding to 20613145 its reverse (54131602), we get a palindrome (74744747).

The spelling of 20613145 in words is "twenty million, six hundred thirteen thousand, one hundred forty-five".