20727730 has 8 divisors (see below), whose sum is σ = 37309932. Its totient is φ = 8291088.

The previous prime is 20727701. The next prime is 20727757. The reversal of 20727730 is 3772702.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 16129 = 4551^2 + 127^2 .

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

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, 1036377 + ... + 1036396.

Almost surely, 2^20727730 is an apocalyptic number.

20727730 is a deficient number, since it is larger than the sum of its proper divisors (16582202).

20727730 is a wasteful number, since it uses less digits than its factorization.

20727730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072780.

The product of its (nonzero) digits is 4116, while the sum is 28.

The square root of 20727730 is about 4552.7716832716. The cubic root of 20727730 is about 274.6948902591.

The spelling of 20727730 in words is "twenty million, seven hundred twenty-seven thousand, seven hundred thirty".