20511841 has 9 divisors (see below), whose sum is σ = 23897649. Its totient is φ = 17554404.

The previous prime is 20511839. The next prime is 20511851. The reversal of 20511841 is 14811502.

The square root of 20511841 is 4529.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20511841 - 2¹ = 20511839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31380 + ... + 32026.

Almost surely, 2^20511841 is an apocalyptic number.

20511841 is the 4529-th square number.

20511841 is the 2265-th centered octagonal number.

It is an amenable number.

20511841 is a deficient number, since it is larger than the sum of its proper divisors (3385808).

20511841 is an frugal number, since it uses more digits than its factorization.

20511841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The cubic root of 20511841 is about 273.7378680083.

The spelling of 20511841 in words is "twenty million, five hundred eleven thousand, eight hundred forty-one".