20662043 has 4 divisors (see below), whose sum is σ = 20788968. Its totient is φ = 20535120.

The previous prime is 20662039. The next prime is 20662049. The reversal of 20662043 is 34026602.

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 20662043 - 2² = 20662039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20662049) 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, 63218 + ... + 63543.

It is an arithmetic number, because the mean of its divisors is an integer number (5197242).

Almost surely, 2^20662043 is an apocalyptic number.

20662043 is a deficient number, since it is larger than the sum of its proper divisors (126925).

20662043 is a wasteful number, since it uses less digits than its factorization.

20662043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126924.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20662043 is about 4545.5520016825. The cubic root of 20662043 is about 274.4044101876.

Adding to 20662043 its reverse (34026602), we get a palindrome (54688645).

The spelling of 20662043 in words is "twenty million, six hundred sixty-two thousand, forty-three".