1020905425 has 6 divisors (see below), whose sum is σ = 1265922758. Its totient is φ = 816724320.

The previous prime is 1020905419. The next prime is 1020905429. The reversal of 1020905425 is 5245090201.

It can be written as a sum of positive squares in 3 ways, for example, as 14493249 + 1006412176 = 3807^2 + 31724^2 .

It is not a de Polignac number, because 1020905425 - 2¹⁹ = 1020381137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020905393 and 1020905402.

It is not an unprimeable number, because it can be changed into a prime (1020905429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20418084 + ... + 20418133.

Almost surely, 2^1020905425 is an apocalyptic number.

It is an amenable number.

1020905425 is a deficient number, since it is larger than the sum of its proper divisors (245017333).

1020905425 is an equidigital number, since it uses as much as digits as its factorization.

1020905425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40836227 (or 40836222 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1020905425 is about 31951.6106792756. The cubic root of 1020905425 is about 1006.9204715924.

Adding to 1020905425 its reverse (5245090201), we get a palindrome (6265995626).

The spelling of 1020905425 in words is "one billion, twenty million, nine hundred five thousand, four hundred twenty-five".