20563455 has 32 divisors (see below), whose sum is σ = 38009088. Its totient is φ = 9382400.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563455 is 55436502.

It is not a de Polignac number, because 20563455 - 2⁶ = 20563391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563457) 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 31 ways as a sum of consecutive naturals, for example, 861 + ... + 6470.

It is an arithmetic number, because the mean of its divisors is an integer number (1187784).

Almost surely, 2^20563455 is an apocalyptic number.

20563455 is a deficient number, since it is larger than the sum of its proper divisors (17445633).

20563455 is a wasteful number, since it uses less digits than its factorization.

20563455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 20563455 is about 4534.6945872903. The cubic root of 20563455 is about 273.9672781355.

Adding to 20563455 its reverse (55436502), we get a palindrome (75999957).

The spelling of 20563455 in words is "twenty million, five hundred sixty-three thousand, four hundred fifty-five".