20948563 has 2 divisors, whose sum is σ = 20948564. Its totient is φ = 20948562.

The previous prime is 20948537. The next prime is 20948579. The reversal of 20948563 is 36584902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20948563 - 2¹³ = 20940371 is a prime.

It is equal to p_1326889 and since 20948563 and 1326889 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20948503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474281 + 10474282.

It is an arithmetic number, because the mean of its divisors is an integer number (10474282).

Almost surely, 2^20948563 is an apocalyptic number.

20948563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948563 is an equidigital number, since it uses as much as digits as its factorization.

20948563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20948563 is about 4576.9600173041. The cubic root of 20948563 is about 275.6669782646. Note that the first 3 decimals are identical.

The spelling of 20948563 in words is "twenty million, nine hundred forty-eight thousand, five hundred sixty-three".