20986903 has 8 divisors (see below), whose sum is σ = 24289280. Its totient is φ = 17760600.

The previous prime is 20986897. The next prime is 20986913. The reversal of 20986903 is 30968902.

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

It is a cyclic number.

It is not a de Polignac number, because 20986903 - 2⁵ = 20986871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986913) 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, 18423 + ... + 19528.

It is an arithmetic number, because the mean of its divisors is an integer number (3036160).

Almost surely, 2^20986903 is an apocalyptic number.

20986903 is a deficient number, since it is larger than the sum of its proper divisors (3302377).

20986903 is an equidigital number, since it uses as much as digits as its factorization.

20986903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38037.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20986903 is about 4581.1464722272. The cubic root of 20986903 is about 275.8350507424.

The spelling of 20986903 in words is "twenty million, nine hundred eighty-six thousand, nine hundred three".