20817166628 has 24 divisors (see below), whose sum is σ = 37694254080. Its totient is φ = 10047532320.

The previous prime is 20817166627. The next prime is 20817166649. The reversal of 20817166628 is 82666171802.

It is not an unprimeable number, because it can be changed into a prime (20817166627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622043 + ... + 654653.

It is an arithmetic number, because the mean of its divisors is an integer number (1570593920).

Almost surely, 2^20817166628 is an apocalyptic number.

It is an amenable number.

20817166628 is a deficient number, since it is larger than the sum of its proper divisors (16877087452).

20817166628 is a wasteful number, since it uses less digits than its factorization.

20817166628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38147 (or 38145 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 20817166628 in words is "twenty billion, eight hundred seventeen million, one hundred sixty-six thousand, six hundred twenty-eight".