20742934 has 8 divisors (see below), whose sum is σ = 31552848. Its totient is φ = 10225320.

The previous prime is 20742929. The next prime is 20742949. The reversal of 20742934 is 43924702.

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 = 20742896 and 20742905.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 72897 + ... + 73180.

It is an arithmetic number, because the mean of its divisors is an integer number (3944106).

Almost surely, 2^20742934 is an apocalyptic number.

20742934 is a deficient number, since it is larger than the sum of its proper divisors (10809914).

20742934 is a wasteful number, since it uses less digits than its factorization.

20742934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146150.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20742934 is about 4554.4411292715. The cubic root of 20742934 is about 274.7620376726.

The spelling of 20742934 in words is "twenty million, seven hundred forty-two thousand, nine hundred thirty-four".