20717982 has 48 divisors (see below), whose sum is σ = 46904832. Its totient is φ = 6601680.

The previous prime is 20717969. The next prime is 20717989. The reversal of 20717982 is 28971702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59533 + ... + 59879.

It is an arithmetic number, because the mean of its divisors is an integer number (977184).

Almost surely, 2^20717982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20717982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23452416).

20717982 is an abundant number, since it is smaller than the sum of its proper divisors (26186850).

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

20717982 is a wasteful number, since it uses less digits than its factorization.

20717982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 20717982 is about 4551.7010007249. The cubic root of 20717982 is about 274.6518216152.

The spelling of 20717982 in words is "twenty million, seven hundred seventeen thousand, nine hundred eighty-two".