20488604643 has 60 divisors (see below), whose sum is σ = 33085830120. Its totient is φ = 12531020112.

The previous prime is 20488604567. The next prime is 20488604659. The reversal of 20488604643 is 34640688402.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20488604643 - 2¹⁸ = 20488342499 is a prime.

It is a super-2 number, since 2×20488604643² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20488604443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 125696880 + ... + 125697042.

It is an arithmetic number, because the mean of its divisors is an integer number (551430502).

Almost surely, 2^20488604643 is an apocalyptic number.

20488604643 is a deficient number, since it is larger than the sum of its proper divisors (12597225477).

20488604643 is an frugal number, since it uses more digits than its factorization.

20488604643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 45.

The spelling of 20488604643 in words is "twenty billion, four hundred eighty-eight million, six hundred four thousand, six hundred forty-three".