20664153718 has 48 divisors (see below), whose sum is σ = 37001653920. Its totient is φ = 8585938944.

The previous prime is 20664153677. The next prime is 20664153737. The reversal of 20664153718 is 81735146602.

It is a super-2 number, since 2×20664153718² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113038 + ... + 232606.

It is an arithmetic number, because the mean of its divisors is an integer number (770867790).

Almost surely, 2^20664153718 is an apocalyptic number.

20664153718 is a deficient number, since it is larger than the sum of its proper divisors (16337500202).

20664153718 is a wasteful number, since it uses less digits than its factorization.

20664153718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119641 (or 119624 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20664153718 in words is "twenty billion, six hundred sixty-four million, one hundred fifty-three thousand, seven hundred eighteen".