20798963 has 4 divisors (see below), whose sum is σ = 20926728. Its totient is φ = 20671200.

The previous prime is 20798959. The next prime is 20798989. The reversal of 20798963 is 36989702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36989702 = 2 ⋅18494851.

It is a cyclic number.

It is not a de Polignac number, because 20798963 - 2² = 20798959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20798993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63638 + ... + 63963.

It is an arithmetic number, because the mean of its divisors is an integer number (5231682).

Almost surely, 2^20798963 is an apocalyptic number.

20798963 is a deficient number, since it is larger than the sum of its proper divisors (127765).

20798963 is a wasteful number, since it uses less digits than its factorization.

20798963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127764.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20798963 is about 4560.5880103338. The cubic root of 20798963 is about 275.0092029978.

The spelling of 20798963 in words is "twenty million, seven hundred ninety-eight thousand, nine hundred sixty-three".