20699691 has 8 divisors (see below), whose sum is σ = 27624000. Its totient is φ = 13787592.

The previous prime is 20699671. The next prime is 20699713. The reversal of 20699691 is 19699602.

It is a happy number.

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

It is not a de Polignac number, because 20699691 - 2¹⁴ = 20683307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20699621) 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, 2196 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (3453000).

Almost surely, 2^20699691 is an apocalyptic number.

20699691 is a deficient number, since it is larger than the sum of its proper divisors (6924309).

20699691 is a wasteful number, since it uses less digits than its factorization.

20699691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20699691 is about 4549.6913082098. The cubic root of 20699691 is about 274.5709717914.

The spelling of 20699691 in words is "twenty million, six hundred ninety-nine thousand, six hundred ninety-one".