1020355505 has 16 divisors (see below), whose sum is σ = 1321968144. Its totient is φ = 751576320.

The previous prime is 1020355451. The next prime is 1020355507. The reversal of 1020355505 is 5055530201.

It can be written as a sum of positive squares in 8 ways, for example, as 263445361 + 756910144 = 16231^2 + 27512^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1020355505 is a prime.

It is a super-2 number, since 2×1020355505² = 2082250713167610050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1020355507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6035 + ... + 45575.

It is an arithmetic number, because the mean of its divisors is an integer number (82623009).

Almost surely, 2^1020355505 is an apocalyptic number.

It is an amenable number.

1020355505 is a deficient number, since it is larger than the sum of its proper divisors (301612639).

1020355505 is a wasteful number, since it uses less digits than its factorization.

1020355505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39956.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 1020355505 is about 31943.0040071375. The cubic root of 1020355505 is about 1006.7396434944.

Adding to 1020355505 its reverse (5055530201), we get a palindrome (6075885706).

The spelling of 1020355505 in words is "one billion, twenty million, three hundred fifty-five thousand, five hundred five".