20841530 has 16 divisors (see below), whose sum is σ = 38430504. Its totient is φ = 8133120.

The previous prime is 20841529. The next prime is 20841547. The reversal of 20841530 is 3514802.

It can be written as a sum of positive squares in 4 ways, for example, as 11175649 + 9665881 = 3343^2 + 3109^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20841496 and 20841505.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25007 + ... + 25826.

Almost surely, 2^20841530 is an apocalyptic number.

20841530 is a deficient number, since it is larger than the sum of its proper divisors (17588974).

20841530 is a wasteful number, since it uses less digits than its factorization.

20841530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50881.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20841530 is about 4565.2524574223. The cubic root of 20841530 is about 275.1966857390.

The spelling of 20841530 in words is "twenty million, eight hundred forty-one thousand, five hundred thirty".