20641043 has 8 divisors (see below), whose sum is σ = 21894912. Its totient is φ = 19391616.

The previous prime is 20641039. The next prime is 20641057. The reversal of 20641043 is 34014602.

It is a happy number.

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 20641043 - 2² = 20641039 is a prime.

It is a super-2 number, since 2×20641043² = 852105312255698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20641013) 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, 17921 + ... + 19037.

It is an arithmetic number, because the mean of its divisors is an integer number (2736864).

Almost surely, 2^20641043 is an apocalyptic number.

20641043 is a deficient number, since it is larger than the sum of its proper divisors (1253869).

20641043 is a wasteful number, since it uses less digits than its factorization.

20641043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20641043 is about 4543.2414639770. The cubic root of 20641043 is about 274.3114144471.

Adding to 20641043 its reverse (34014602), we get a palindrome (54655645).

The spelling of 20641043 in words is "twenty million, six hundred forty-one thousand, forty-three".