20980963 has 4 divisors (see below), whose sum is σ = 21005608. Its totient is φ = 20956320.

The previous prime is 20980957. The next prime is 20980987. The reversal of 20980963 is 36908902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36908902 = 2 ⋅18454451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20980963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20980903) 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, 10998 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (5251402).

Almost surely, 2^20980963 is an apocalyptic number.

20980963 is a deficient number, since it is larger than the sum of its proper divisors (24645).

20980963 is an equidigital number, since it uses as much as digits as its factorization.

20980963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24644.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20980963 is about 4580.4981170174. The cubic root of 20980963 is about 275.8090247520.

The spelling of 20980963 in words is "twenty million, nine hundred eighty thousand, nine hundred sixty-three".