20807530 has 16 divisors (see below), whose sum is σ = 38089440. Its totient is φ = 8181712.

The previous prime is 20807503. The next prime is 20807533. The reversal of 20807530 is 3570802.

It is a super-3 number, since 3×20807530³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20807495 and 20807504.

It is not an unprimeable number, because it can be changed into a prime (20807533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17044 + ... + 18223.

It is an arithmetic number, because the mean of its divisors is an integer number (2380590).

Almost surely, 2^20807530 is an apocalyptic number.

20807530 is a deficient number, since it is larger than the sum of its proper divisors (17281910).

20807530 is a wasteful number, since it uses less digits than its factorization.

20807530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35333.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20807530 is about 4561.5271565562. The cubic root of 20807530 is about 275.0469561691.

The spelling of 20807530 in words is "twenty million, eight hundred seven thousand, five hundred thirty".