1020605565 has 48 divisors (see below), whose sum is σ = 1982199168. Its totient is φ = 446269824.

The previous prime is 1020605563. The next prime is 1020605587. The reversal of 1020605565 is 5655060201.

It is not a de Polignac number, because 1020605565 - 2¹ = 1020605563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020605561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13282 + ... + 47091.

It is an arithmetic number, because the mean of its divisors is an integer number (41295816).

Almost surely, 2^1020605565 is an apocalyptic number.

1020605565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020605565 is a deficient number, since it is larger than the sum of its proper divisors (961593603).

1020605565 is a wasteful number, since it uses less digits than its factorization.

1020605565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60418 (or 60411 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1020605565 is about 31946.9179264604. The cubic root of 1020605565 is about 1006.8218778241.

Adding to 1020605565 its reverse (5655060201), we get a palindrome (6675665766).

The spelling of 1020605565 in words is "one billion, twenty million, six hundred five thousand, five hundred sixty-five".