20670043 has 4 divisors (see below), whose sum is σ = 21757960. Its totient is φ = 19582128.

The previous prime is 20670007. The next prime is 20670047. The reversal of 20670043 is 34007602.

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 20670043 - 2⁹ = 20669531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20669996 and 20670023.

It is not an unprimeable number, because it can be changed into a prime (20670047) 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, 543930 + ... + 543967.

It is an arithmetic number, because the mean of its divisors is an integer number (5439490).

Almost surely, 2^20670043 is an apocalyptic number.

20670043 is a deficient number, since it is larger than the sum of its proper divisors (1087917).

20670043 is a wasteful number, since it uses less digits than its factorization.

20670043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087916.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20670043 is about 4546.4318976534. The cubic root of 20670043 is about 274.4398205618.

Adding to 20670043 its reverse (34007602), we get a palindrome (54677645).

The spelling of 20670043 in words is "twenty million, six hundred seventy thousand, forty-three".