20743730 has 32 divisors (see below), whose sum is σ = 42837120. Its totient is φ = 7084800.

The previous prime is 20743711. The next prime is 20743739. The reversal of 20743730 is 3734702.

It is a self number, because there is not a number n which added to its sum of digits gives 20743730.

It is not an unprimeable number, because it can be changed into a prime (20743739) 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 15 ways as a sum of consecutive naturals, for example, 27701 + ... + 28439.

It is an arithmetic number, because the mean of its divisors is an integer number (1338660).

Almost surely, 2^20743730 is an apocalyptic number.

20743730 is an abundant number, since it is smaller than the sum of its proper divisors (22093390).

20743730 is a wasteful number, since it uses less digits than its factorization.

20743730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 3528, while the sum is 26.

The square root of 20743730 is about 4554.5285156644. The cubic root of 20743730 is about 274.7655522475.

Subtracting from 20743730 its reverse (3734702), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 20743730 in words is "twenty million, seven hundred forty-three thousand, seven hundred thirty".