20717542 has 8 divisors (see below), whose sum is σ = 32148000. Its totient is φ = 10001544.

The previous prime is 20717537. The next prime is 20717569. The reversal of 20717542 is 24571702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20717542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178542 + ... + 178657.

It is an arithmetic number, because the mean of its divisors is an integer number (4018500).

Almost surely, 2^20717542 is an apocalyptic number.

20717542 is a deficient number, since it is larger than the sum of its proper divisors (11430458).

20717542 is a wasteful number, since it uses less digits than its factorization.

20717542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357230.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20717542 is about 4551.6526668892. The cubic root of 20717542 is about 274.6498772872.

The spelling of 20717542 in words is "twenty million, seven hundred seventeen thousand, five hundred forty-two".