20133641 has 4 divisors (see below), whose sum is σ = 21963984. Its totient is φ = 18303300.

The previous prime is 20133629. The next prime is 20133649. The reversal of 20133641 is 14633102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20133641 - 2¹⁰ = 20132617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20133649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915155 + ... + 915176.

It is an arithmetic number, because the mean of its divisors is an integer number (5490996).

Almost surely, 2^20133641 is an apocalyptic number.

It is an amenable number.

20133641 is a deficient number, since it is larger than the sum of its proper divisors (1830343).

20133641 is a wasteful number, since it uses less digits than its factorization.

20133641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830342.

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

The square root of 20133641 is about 4487.0525960813. The cubic root of 20133641 is about 272.0450157978.

Adding to 20133641 its reverse (14633102), we get a palindrome (34766743).

The spelling of 20133641 in words is "twenty million, one hundred thirty-three thousand, six hundred forty-one".