20662005717 has 32 divisors (see below), whose sum is σ = 32422412160. Its totient is φ = 12959827200.

The previous prime is 20662005713. The next prime is 20662005757. The reversal of 20662005717 is 71750026602.

20662005717 is a `hidden beast` number, since 2 + 0 + 66 + 20 + 0 + 571 + 7 = 666.

It is not a de Polignac number, because 20662005717 - 2² = 20662005713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662005713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1692678 + ... + 1704840.

It is an arithmetic number, because the mean of its divisors is an integer number (1013200380).

Almost surely, 2^20662005717 is an apocalyptic number.

20662005717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20662005717 is a deficient number, since it is larger than the sum of its proper divisors (11760406443).

20662005717 is a wasteful number, since it uses less digits than its factorization.

20662005717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15890 (or 15884 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 20662005717 in words is "twenty billion, six hundred sixty-two million, five thousand, seven hundred seventeen".