20563454 has 4 divisors (see below), whose sum is σ = 30845184. Its totient is φ = 10281726.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563454 is 45436502.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5140862 + ... + 5140865.

It is an arithmetic number, because the mean of its divisors is an integer number (7711296).

Almost surely, 2^20563454 is an apocalyptic number.

20563454 is a deficient number, since it is larger than the sum of its proper divisors (10281730).

20563454 is a wasteful number, since it uses less digits than its factorization.

20563454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281729.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 20563454 is about 4534.6944770293. The cubic root of 20563454 is about 273.9672736945.

Adding to 20563454 its reverse (45436502), we get a palindrome (65999956).

The spelling of 20563454 in words is "twenty million, five hundred sixty-three thousand, four hundred fifty-four".