20820512 has 24 divisors (see below), whose sum is σ = 43402716. Its totient is φ = 9797632.

The previous prime is 20820511. The next prime is 20820533. The reversal of 20820512 is 21502802.

It can be written as a sum of positive squares in 2 ways, for example, as 18011536 + 2808976 = 4244^2 + 1676^2 .

It is not an unprimeable number, because it can be changed into a prime (20820511) 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, 18593 + ... + 19680.

Almost surely, 2^20820512 is an apocalyptic number.

It is an amenable number.

20820512 is an abundant number, since it is smaller than the sum of its proper divisors (22582204).

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

20820512 is a wasteful number, since it uses less digits than its factorization.

20820512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38300 (or 38292 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20820512 is about 4562.9499230213. The cubic root of 20820512 is about 275.1041456778.

The spelling of 20820512 in words is "twenty million, eight hundred twenty thousand, five hundred twelve".