20604523643 has 16 divisors (see below), whose sum is σ = 23415659520. Its totient is φ = 17960810400.

The previous prime is 20604523631. The next prime is 20604523661. The reversal of 20604523643 is 34632540602.

It is a cyclic number.

It is not a de Polignac number, because 20604523643 - 2⁶ = 20604523579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20604523663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240005 + ... + 314342.

It is an arithmetic number, because the mean of its divisors is an integer number (1463478720).

Almost surely, 2^20604523643 is an apocalyptic number.

20604523643 is a deficient number, since it is larger than the sum of its proper divisors (2811135877).

20604523643 is a wasteful number, since it uses less digits than its factorization.

20604523643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554498.

The product of its (nonzero) digits is 103680, while the sum is 35.

The spelling of 20604523643 in words is "twenty billion, six hundred four million, five hundred twenty-three thousand, six hundred forty-three".