20824661 has 16 divisors (see below), whose sum is σ = 24712128. Its totient is φ = 17299200.

The previous prime is 20824651. The next prime is 20824669. The reversal of 20824661 is 16642802.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20824661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20824669) 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 15 ways as a sum of consecutive naturals, for example, 14621 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (1544508).

Almost surely, 2^20824661 is an apocalyptic number.

It is an amenable number.

20824661 is a deficient number, since it is larger than the sum of its proper divisors (3887467).

20824661 is a wasteful number, since it uses less digits than its factorization.

20824661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20824661 is about 4563.4045404719. The cubic root of 20824661 is about 275.1224182238.

The spelling of 20824661 in words is "twenty million, eight hundred twenty-four thousand, six hundred sixty-one".