20742357 has 8 divisors (see below), whose sum is σ = 29112160. Its totient is φ = 13100400.

The previous prime is 20742353. The next prime is 20742377. The reversal of 20742357 is 75324702.

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

It is not a de Polignac number, because 20742357 - 2² = 20742353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181894 + ... + 182007.

It is an arithmetic number, because the mean of its divisors is an integer number (3639020).

Almost surely, 2^20742357 is an apocalyptic number.

It is an amenable number.

20742357 is a deficient number, since it is larger than the sum of its proper divisors (8369803).

20742357 is a wasteful number, since it uses less digits than its factorization.

20742357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363923.

The product of its (nonzero) digits is 11760, while the sum is 30.

The square root of 20742357 is about 4554.3777840667. The cubic root of 20742357 is about 274.7594899911.

The spelling of 20742357 in words is "twenty million, seven hundred forty-two thousand, three hundred fifty-seven".