20260643 has 4 divisors (see below), whose sum is σ = 21819168. Its totient is φ = 18702120.

The previous prime is 20260637. The next prime is 20260649. The reversal of 20260643 is 34606202.

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

It is an interprime number because it is at equal distance from previous prime (20260637) and next prime (20260649).

It is a cyclic number.

It is not a de Polignac number, because 20260643 - 2⁴ = 20260627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20260649) 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, 779243 + ... + 779268.

It is an arithmetic number, because the mean of its divisors is an integer number (5454792).

Almost surely, 2^20260643 is an apocalyptic number.

20260643 is a deficient number, since it is larger than the sum of its proper divisors (1558525).

20260643 is a wasteful number, since it uses less digits than its factorization.

20260643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558524.

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

The square root of 20260643 is about 4501.1824002144. The cubic root of 20260643 is about 272.6158326959.

Adding to 20260643 its reverse (34606202), we get a palindrome (54866845).

The spelling of 20260643 in words is "twenty million, two hundred sixty thousand, six hundred forty-three".