20709616 has 10 divisors (see below), whose sum is σ = 40124912. Its totient is φ = 10354800.

The previous prime is 20709607. The next prime is 20709629. The reversal of 20709616 is 61690702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647160 + ... + 647191.

Almost surely, 2^20709616 is an apocalyptic number.

It is an amenable number.

20709616 is a deficient number, since it is larger than the sum of its proper divisors (19415296).

20709616 is a wasteful number, since it uses less digits than its factorization.

20709616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294359 (or 1294353 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20709616 is about 4550.7819108369. The cubic root of 20709616 is about 274.6148481544.

The spelling of 20709616 in words is "twenty million, seven hundred nine thousand, six hundred sixteen".