20654563 has 2 divisors, whose sum is σ = 20654564. Its totient is φ = 20654562.

The previous prime is 20654561. The next prime is 20654591. The reversal of 20654563 is 36545602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20654563 - 2¹ = 20654561 is a prime.

It is a super-2 number, since 2×20654563² = 853221945441938, which contains 22 as substring.

Together with 20654561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20654561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327281 + 10327282.

It is an arithmetic number, because the mean of its divisors is an integer number (10327282).

Almost surely, 2^20654563 is an apocalyptic number.

20654563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654563 is an equidigital number, since it uses as much as digits as its factorization.

20654563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20654563 is about 4544.7291448446. The cubic root of 20654563 is about 274.3712932184.

The spelling of 20654563 in words is "twenty million, six hundred fifty-four thousand, five hundred sixty-three".