20661411603 has 32 divisors (see below), whose sum is σ = 32074283520. Its totient is φ = 11585894400.

The previous prime is 20661411593. The next prime is 20661411607. The reversal of 20661411603 is 30611416602.

It is not a de Polignac number, because 20661411603 - 2¹⁸ = 20661149459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20661411607) 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 31 ways as a sum of consecutive naturals, for example, 700453 + ... + 729353.

It is an arithmetic number, because the mean of its divisors is an integer number (1002321360).

Almost surely, 2^20661411603 is an apocalyptic number.

20661411603 is a deficient number, since it is larger than the sum of its proper divisors (11412871917).

20661411603 is a wasteful number, since it uses less digits than its factorization.

20661411603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29547.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 20661411603 in words is "twenty billion, six hundred sixty-one million, four hundred eleven thousand, six hundred three".