20963405 has 8 divisors (see below), whose sum is σ = 25196184. Its totient is φ = 16744000.

The previous prime is 20963401. The next prime is 20963413. The reversal of 20963405 is 50436902.

It can be written as a sum of positive squares in 4 ways, for example, as 946729 + 20016676 = 973^2 + 4474^2 .

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

It is not a de Polignac number, because 20963405 - 2² = 20963401 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 (20963401) 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, 515 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (3149523).

Almost surely, 2^20963405 is an apocalyptic number.

It is an amenable number.

20963405 is a deficient number, since it is larger than the sum of its proper divisors (4232779).

20963405 is an equidigital number, since it uses as much as digits as its factorization.

20963405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6687.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20963405 is about 4578.5811120914. The cubic root of 20963405 is about 275.7320659974.

The spelling of 20963405 in words is "twenty million, nine hundred sixty-three thousand, four hundred five".