20730120 has 32 divisors (see below), whose sum is σ = 62190720. Its totient is φ = 5528000.

The previous prime is 20730119. The next prime is 20730131. The reversal of 20730120 is 2103702.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20730120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86256 + ... + 86495.

It is an arithmetic number, because the mean of its divisors is an integer number (1943460).

Almost surely, 2^20730120 is an apocalyptic number.

20730120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20730120 is an abundant number, since it is smaller than the sum of its proper divisors (41460600).

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

20730120 is a wasteful number, since it uses less digits than its factorization.

20730120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172765 (or 172761 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 20730120 is about 4553.0341531774. The cubic root of 20730120 is about 274.7054477033.

Adding to 20730120 its reverse (2103702), we get a palindrome (22833822).

The spelling of 20730120 in words is "twenty million, seven hundred thirty thousand, one hundred twenty".