20845742 has 8 divisors (see below), whose sum is σ = 31709232. Its totient is φ = 10276000.

The previous prime is 20845711. The next prime is 20845771. The reversal of 20845742 is 24754802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20845699 and 20845708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73259 + ... + 73542.

It is an arithmetic number, because the mean of its divisors is an integer number (3963654).

Almost surely, 2^20845742 is an apocalyptic number.

20845742 is a deficient number, since it is larger than the sum of its proper divisors (10863490).

20845742 is a wasteful number, since it uses less digits than its factorization.

20845742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146874.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 20845742 is about 4565.7137448596. The cubic root of 20845742 is about 275.2152232514.

The spelling of 20845742 in words is "twenty million, eight hundred forty-five thousand, seven hundred forty-two".