20601720018 has 24 divisors (see below), whose sum is σ = 48694975056. Its totient is φ = 6242945400.

The previous prime is 20601720017. The next prime is 20601720101. The reversal of 20601720018 is 81002710602.

20601720018 is a `hidden beast` number, since 20 + 601 + 7 + 20 + 0 + 18 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20601719973 and 20601720000.

It is not an unprimeable number, because it can be changed into a prime (20601720017) 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 11 ways as a sum of consecutive naturals, for example, 52024348 + ... + 52024743.

It is an arithmetic number, because the mean of its divisors is an integer number (2028957294).

Almost surely, 2^20601720018 is an apocalyptic number.

20601720018 is an abundant number, since it is smaller than the sum of its proper divisors (28093255038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20601720018 is a wasteful number, since it uses less digits than its factorization.

20601720018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104049110 (or 104049107 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The spelling of 20601720018 in words is "twenty billion, six hundred one million, seven hundred twenty thousand, eighteen".