20477664518 has 8 divisors (see below), whose sum is σ = 30727801920. Its totient is φ = 10235063880.

The previous prime is 20477664511. The next prime is 20477664533. The reversal of 20477664518 is 81546677402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20477664518² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477664511) 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 3 ways as a sum of consecutive naturals, for example, 1877393 + ... + 1888268.

It is an arithmetic number, because the mean of its divisors is an integer number (3840975240).

Almost surely, 2^20477664518 is an apocalyptic number.

20477664518 is a deficient number, since it is larger than the sum of its proper divisors (10250137402).

20477664518 is a wasteful number, since it uses less digits than its factorization.

20477664518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3768382.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20477664518 in words is "twenty billion, four hundred seventy-seven million, six hundred sixty-four thousand, five hundred eighteen".