20785130 has 8 divisors (see below), whose sum is σ = 37413252. Its totient is φ = 8314048.

The previous prime is 20785129. The next prime is 20785133. The reversal of 20785130 is 3158702.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 866761 = 4463^2 + 931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 20785130.

It is not an unprimeable number, because it can be changed into a prime (20785133) 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, 1039247 + ... + 1039266.

Almost surely, 2^20785130 is an apocalyptic number.

20785130 is a deficient number, since it is larger than the sum of its proper divisors (16628122).

20785130 is a wasteful number, since it uses less digits than its factorization.

20785130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078520.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20785130 is about 4559.0711773343. The cubic root of 20785130 is about 274.9482216565.

The spelling of 20785130 in words is "twenty million, seven hundred eighty-five thousand, one hundred thirty".