20709730 has 8 divisors (see below), whose sum is σ = 37277532. Its totient is φ = 8283888.

The previous prime is 20709727. The next prime is 20709769. The reversal of 20709730 is 3790702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20421361 + 288369 = 4519^2 + 537^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035477 + ... + 1035496.

Almost surely, 2^20709730 is an apocalyptic number.

20709730 is a deficient number, since it is larger than the sum of its proper divisors (16567802).

20709730 is a wasteful number, since it uses less digits than its factorization.

20709730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070980.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 20709730 is about 4550.7944361397. The cubic root of 20709730 is about 274.6153520433.

The spelling of 20709730 in words is "twenty million, seven hundred nine thousand, seven hundred thirty".