20963853 has 28 divisors (see below), whose sum is σ = 31806300. Its totient is φ = 13810176.

The previous prime is 20963851. The next prime is 20963869. The reversal of 20963853 is 35836902.

It can be written as a sum of positive squares in 2 ways, for example, as 3674889 + 17288964 = 1917^2 + 4158^2 .

It is not a de Polignac number, because 20963853 - 2¹ = 20963851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963851) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 108525 + ... + 108717.

Almost surely, 2^20963853 is an apocalyptic number.

It is an amenable number.

20963853 is a deficient number, since it is larger than the sum of its proper divisors (10842447).

20963853 is an equidigital number, since it uses as much as digits as its factorization.

20963853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20963853 is about 4578.6300352835. The cubic root of 20963853 is about 275.7340301676.

The spelling of 20963853 in words is "twenty million, nine hundred sixty-three thousand, eight hundred fifty-three".