20113643 has 8 divisors (see below), whose sum is σ = 21987120. Its totient is φ = 18247680.

The previous prime is 20113633. The next prime is 20113649. The reversal of 20113643 is 34631102.

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

It is not a de Polignac number, because 20113643 - 2⁴ = 20113627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20113649) 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, 4763 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (2748390).

Almost surely, 2^20113643 is an apocalyptic number.

20113643 is a deficient number, since it is larger than the sum of its proper divisors (1873477).

20113643 is a wasteful number, since it uses less digits than its factorization.

20113643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20113643 is about 4484.8236308689. The cubic root of 20113643 is about 271.9549152135.

Adding to 20113643 its reverse (34631102), we get a palindrome (54744745).

The spelling of 20113643 in words is "twenty million, one hundred thirteen thousand, six hundred forty-three".