20643083 has 4 divisors (see below), whose sum is σ = 21857400. Its totient is φ = 19428768.

The previous prime is 20643061. The next prime is 20643107. The reversal of 20643083 is 38034602.

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 20643083 - 2¹⁰ = 20642059 is a prime.

It is a super-2 number, since 2×20643083² = 852273751489778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20643043) 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, 607133 + ... + 607166.

It is an arithmetic number, because the mean of its divisors is an integer number (5464350).

Almost surely, 2^20643083 is an apocalyptic number.

20643083 is a deficient number, since it is larger than the sum of its proper divisors (1214317).

20643083 is a wasteful number, since it uses less digits than its factorization.

20643083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214316.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20643083 is about 4543.4659677387. The cubic root of 20643083 is about 274.3204510843.

Adding to 20643083 its reverse (38034602), we get a palindrome (58677685).

The spelling of 20643083 in words is "twenty million, six hundred forty-three thousand, eighty-three".