20262563 has 4 divisors (see below), whose sum is σ = 21143568. Its totient is φ = 19381560.

The previous prime is 20262533. The next prime is 20262581. The reversal of 20262563 is 36526202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36526202 = 2 ⋅18263101.

It is a cyclic number.

It is not a de Polignac number, because 20262563 - 2¹² = 20258467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20262533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440468 + ... + 440513.

It is an arithmetic number, because the mean of its divisors is an integer number (5285892).

Almost surely, 2^20262563 is an apocalyptic number.

20262563 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20262563 is a deficient number, since it is larger than the sum of its proper divisors (881005).

20262563 is an equidigital number, since it uses as much as digits as its factorization.

20262563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881004.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 20262563 is about 4501.3956724554. The cubic root of 20262563 is about 272.6244439044.

Adding to 20262563 its reverse (36526202), we get a palindrome (56788765).

The spelling of 20262563 in words is "twenty million, two hundred sixty-two thousand, five hundred sixty-three".