20717270658 has 192 divisors, whose sum is σ = 54419040000. Its totient is φ = 5688942336.

The previous prime is 20717270653. The next prime is 20717270683. The reversal of 20717270658 is 85607271702.

It is not an unprimeable number, because it can be changed into a prime (20717270653) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20330473 + ... + 20331491.

It is an arithmetic number, because the mean of its divisors is an integer number (283432500).

Almost surely, 2^20717270658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20717270658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27209520000).

20717270658 is an abundant number, since it is smaller than the sum of its proper divisors (33701769342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20717270658 is a wasteful number, since it uses less digits than its factorization.

20717270658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 20717270658 in words is "twenty billion, seven hundred seventeen million, two hundred seventy thousand, six hundred fifty-eight".