20730260 has 12 divisors (see below), whose sum is σ = 43533588. Its totient is φ = 8292096.

The previous prime is 20730253. The next prime is 20730263. The reversal of 20730260 is 6203702.

It can be written as a sum of positive squares in 2 ways, for example, as 14032516 + 6697744 = 3746^2 + 2588^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1036513 = 20730260 / (2 + 0 + 7 + 3 + 0 + 2 + 6 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518237 + ... + 518276.

It is an arithmetic number, because the mean of its divisors is an integer number (3627799).

Almost surely, 2^20730260 is an apocalyptic number.

20730260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20730260 is an abundant number, since it is smaller than the sum of its proper divisors (22803328).

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

20730260 is a wasteful number, since it uses less digits than its factorization.

20730260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036522 (or 1036520 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20730260 is about 4553.0495275145. The cubic root of 20730260 is about 274.7060661058.

Adding to 20730260 its reverse (6203702), we get a palindrome (26933962).

The spelling of 20730260 in words is "twenty million, seven hundred thirty thousand, two hundred sixty".