20985603 has 8 divisors (see below), whose sum is σ = 28002048. Its totient is φ = 13979784.

The previous prime is 20985593. The next prime is 20985617. The reversal of 20985603 is 30658902.

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 20985603 - 2¹² = 20981507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20985203) 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, 5826 + ... + 8712.

It is an arithmetic number, because the mean of its divisors is an integer number (3500256).

Almost surely, 2^20985603 is an apocalyptic number.

20985603 is a deficient number, since it is larger than the sum of its proper divisors (7016445).

20985603 is a wasteful number, since it uses less digits than its factorization.

20985603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5313.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20985603 is about 4581.0045841496. The cubic root of 20985603 is about 275.8293552384.

The spelling of 20985603 in words is "twenty million, nine hundred eighty-five thousand, six hundred three".