20664130988 has 6 divisors (see below), whose sum is σ = 36162229236. Its totient is φ = 10332065492.

The previous prime is 20664130987. The next prime is 20664130997. The reversal of 20664130988 is 88903146602.

It is a super-2 number, since 2×20664130988² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20664130987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583016370 + ... + 2583016377.

It is an arithmetic number, because the mean of its divisors is an integer number (6027038206).

Almost surely, 2^20664130988 is an apocalyptic number.

It is an amenable number.

20664130988 is a deficient number, since it is larger than the sum of its proper divisors (15498098248).

20664130988 is a wasteful number, since it uses less digits than its factorization.

20664130988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166032751 (or 5166032749 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 20664130988 in words is "twenty billion, six hundred sixty-four million, one hundred thirty thousand, nine hundred eighty-eight".