20100043 has 4 divisors (see below), whose sum is σ = 21157960. Its totient is φ = 19042128.

The previous prime is 20100023. The next prime is 20100053. The reversal of 20100043 is 34000102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20100043 - 2²¹ = 18002891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100023) 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, 528930 + ... + 528967.

It is an arithmetic number, because the mean of its divisors is an integer number (5289490).

Almost surely, 2^20100043 is an apocalyptic number.

20100043 is a deficient number, since it is larger than the sum of its proper divisors (1057917).

20100043 is a wasteful number, since it uses less digits than its factorization.

20100043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057916.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20100043 is about 4483.3071498616. The cubic root of 20100043 is about 271.8936065656.

Adding to 20100043 its reverse (34000102), we get a palindrome (54100145).

The spelling of 20100043 in words is "twenty million, one hundred thousand, forty-three".