1020905256 has 32 divisors (see below), whose sum is σ = 2916872640. Its totient is φ = 291687168.

The previous prime is 1020905251. The next prime is 1020905311. The reversal of 1020905256 is 6525090201.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1020905251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3038241 + ... + 3038576.

It is an arithmetic number, because the mean of its divisors is an integer number (91152270).

Almost surely, 2^1020905256 is an apocalyptic number.

It is an amenable number.

1020905256 is an abundant number, since it is smaller than the sum of its proper divisors (1895967384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020905256 is a wasteful number, since it uses less digits than its factorization.

1020905256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076833 (or 6076829 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1020905256 is about 31951.6080346514. The cubic root of 1020905256 is about 1006.9204160307.

Adding to 1020905256 its reverse (6525090201), we get a palindrome (7545995457).

The spelling of 1020905256 in words is "one billion, twenty million, nine hundred five thousand, two hundred fifty-six".