20709699 has 8 divisors (see below), whose sum is σ = 27635472. Its totient is φ = 13795200.

The previous prime is 20709691. The next prime is 20709701. The reversal of 20709699 is 99690702.

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

It is not a de Polignac number, because 20709699 - 2³ = 20709691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20709699.

It is not an unprimeable number, because it can be changed into a prime (20709691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3487 + ... + 7319.

It is an arithmetic number, because the mean of its divisors is an integer number (3454434).

Almost surely, 2^20709699 is an apocalyptic number.

20709699 is a deficient number, since it is larger than the sum of its proper divisors (6925773).

20709699 is a wasteful number, since it uses less digits than its factorization.

20709699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5637.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 20709699 is about 4550.7910301397. The cubic root of 20709699 is about 274.6152150210.

The spelling of 20709699 in words is "twenty million, seven hundred nine thousand, six hundred ninety-nine".