20963451 has 4 divisors (see below), whose sum is σ = 27951272. Its totient is φ = 13975632.

The previous prime is 20963417. The next prime is 20963473. The reversal of 20963451 is 15436902.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20963451 - 2⁶ = 20963387 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 3493906 + ... + 3493911.

It is an arithmetic number, because the mean of its divisors is an integer number (6987818).

Almost surely, 2^20963451 is an apocalyptic number.

20963451 is a deficient number, since it is larger than the sum of its proper divisors (6987821).

20963451 is an equidigital number, since it uses as much as digits as its factorization.

20963451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6987820.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20963451 is about 4578.5861354789. The cubic root of 20963451 is about 275.7322676769.

The spelling of 20963451 in words is "twenty million, nine hundred sixty-three thousand, four hundred fifty-one".