1020026563 has 4 divisors (see below), whose sum is σ = 1064375568. Its totient is φ = 975677560.

The previous prime is 1020026551. The next prime is 1020026569. The reversal of 1020026563 is 3656200201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3656200201 = 29 ⋅126075869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020026563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020026569) 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 3 ways as a sum of consecutive naturals, for example, 22174468 + ... + 22174513.

It is an arithmetic number, because the mean of its divisors is an integer number (266093892).

Almost surely, 2^1020026563 is an apocalyptic number.

1020026563 is a deficient number, since it is larger than the sum of its proper divisors (44349005).

1020026563 is an equidigital number, since it uses as much as digits as its factorization.

1020026563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44349004.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1020026563 is about 31937.8547025313. The cubic root of 1020026563 is about 1006.6314476931.

Adding to 1020026563 its reverse (3656200201), we get a palindrome (4676226764).

It can be divided in two parts, 10200 and 26563, that added together give a palindrome (36763).

The spelling of 1020026563 in words is "one billion, twenty million, twenty-six thousand, five hundred sixty-three".