20643200 has 48 divisors (see below), whose sum is σ = 51003060. Its totient is φ = 8256000.

The previous prime is 20643197. The next prime is 20643211. The reversal of 20643200 is 234602.

It is a super-2 number, since 2×20643200² = 852283412480000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26 + ... + 6425.

Almost surely, 2^20643200 is an apocalyptic number.

20643200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20643200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25501530).

20643200 is an abundant number, since it is smaller than the sum of its proper divisors (30359860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20643200 is an equidigital number, since it uses as much as digits as its factorization.

20643200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6475 (or 6458 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20643200 is about 4543.4788433534. The cubic root of 20643200 is about 274.3209693440.

Adding to 20643200 its reverse (234602), we get a palindrome (20877802).

The spelling of 20643200 in words is "twenty million, six hundred forty-three thousand, two hundred".