20716730 has 16 divisors (see below), whose sum is σ = 38576520. Its totient is φ = 8000832.

The previous prime is 20716697. The next prime is 20716739. The reversal of 20716730 is 3761702.

It can be written as a sum of positive squares in 4 ways, for example, as 18809569 + 1907161 = 4337^2 + 1381^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20716730.

It is not an unprimeable number, because it can be changed into a prime (20716739) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 35429 + ... + 36008.

Almost surely, 2^20716730 is an apocalyptic number.

20716730 is a deficient number, since it is larger than the sum of its proper divisors (17859790).

20716730 is a wasteful number, since it uses less digits than its factorization.

20716730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71473.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20716730 is about 4551.5634676449. The cubic root of 20716730 is about 274.6462890460.

The spelling of 20716730 in words is "twenty million, seven hundred sixteen thousand, seven hundred thirty".