206721120 has 96 divisors (see below), whose sum is σ = 654000480. Its totient is φ = 54886400.

The previous prime is 206721107. The next prime is 206721127. The reversal of 206721120 is 21127602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206721127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128320 + ... + 129920.

It is an arithmetic number, because the mean of its divisors is an integer number (6812505).

Almost surely, 2^206721120 is an apocalyptic number.

206721120 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 206721120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327000240).

206721120 is an abundant number, since it is smaller than the sum of its proper divisors (447279360).

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

206721120 is a wasteful number, since it uses less digits than its factorization.

206721120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888 (or 1880 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 206721120 is about 14377.7995534783. The cubic root of 206721120 is about 591.2823968708.

Adding to 206721120 its reverse (21127602), we get a palindrome (227848722).

The spelling of 206721120 in words is "two hundred six million, seven hundred twenty-one thousand, one hundred twenty".