20899307 has 16 divisors (see below), whose sum is σ = 26000352. Its totient is φ = 16504320.

The previous prime is 20899303. The next prime is 20899309. The reversal of 20899307 is 70399802.

It is a cyclic number.

It is not a de Polignac number, because 20899307 - 2² = 20899303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20899303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1868 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (1625022).

Almost surely, 2^20899307 is an apocalyptic number.

20899307 is a deficient number, since it is larger than the sum of its proper divisors (5101045).

20899307 is a wasteful number, since it uses less digits than its factorization.

20899307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20899307 is about 4571.5759864624. The cubic root of 20899307 is about 275.4507516797.

The spelling of 20899307 in words is "twenty million, eight hundred ninety-nine thousand, three hundred seven".