20143645 has 8 divisors (see below), whose sum is σ = 24952320. Its totient is φ = 15594960.

The previous prime is 20143639. The next prime is 20143649. The reversal of 20143645 is 54634102.

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

It is not a de Polignac number, because 20143645 - 2⁷ = 20143517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143649) 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, 64825 + ... + 65134.

It is an arithmetic number, because the mean of its divisors is an integer number (3119040).

Almost surely, 2^20143645 is an apocalyptic number.

It is an amenable number.

20143645 is a deficient number, since it is larger than the sum of its proper divisors (4808675).

20143645 is a wasteful number, since it uses less digits than its factorization.

20143645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129995.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20143645 is about 4488.1672205924. The cubic root of 20143645 is about 272.0900662303.

Adding to 20143645 its reverse (54634102), we get a palindrome (74777747).

The spelling of 20143645 in words is "twenty million, one hundred forty-three thousand, six hundred forty-five".