20559730 has 16 divisors (see below), whose sum is σ = 37635840. Its totient is φ = 8084272.

The previous prime is 20559713. The next prime is 20559733. The reversal of 20559730 is 3795502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20559692 and 20559701.

It is not an unprimeable number, because it can be changed into a prime (20559733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16834 + ... + 18013.

It is an arithmetic number, because the mean of its divisors is an integer number (2352240).

Almost surely, 2^20559730 is an apocalyptic number.

20559730 is a deficient number, since it is larger than the sum of its proper divisors (17076110).

20559730 is a wasteful number, since it uses less digits than its factorization.

20559730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34913.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 20559730 is about 4534.2838464304. The cubic root of 20559730 is about 273.9507343893.

The spelling of 20559730 in words is "twenty million, five hundred fifty-nine thousand, seven hundred thirty".