20717942 has 32 divisors (see below), whose sum is σ = 37946880. Its totient is φ = 8285760.

The previous prime is 20717927. The next prime is 20717947. The reversal of 20717942 is 24971702.

It is a junction number, because it is equal to n+sod(n) for n = 20717899 and 20717908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18338 + ... + 19434.

It is an arithmetic number, because the mean of its divisors is an integer number (1185840).

Almost surely, 2^20717942 is an apocalyptic number.

20717942 is a deficient number, since it is larger than the sum of its proper divisors (17228938).

20717942 is a wasteful number, since it uses less digits than its factorization.

20717942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20717942 is about 4551.6966067610. The cubic root of 20717942 is about 274.6516448593.

The spelling of 20717942 in words is "twenty million, seven hundred seventeen thousand, nine hundred forty-two".