1020505420 has 48 divisors (see below), whose sum is σ = 2345420448. Its totient is φ = 369896960.

The previous prime is 1020505403. The next prime is 1020505429. The reversal of 1020505420 is 245050201.

It is not an unprimeable number, because it can be changed into a prime (1020505429) 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 15 ways as a sum of consecutive naturals, for example, 62424 + ... + 77056.

It is an arithmetic number, because the mean of its divisors is an integer number (48862926).

Almost surely, 2^1020505420 is an apocalyptic number.

1020505420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020505420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172710224).

1020505420 is an abundant number, since it is smaller than the sum of its proper divisors (1324915028).

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

1020505420 is a wasteful number, since it uses less digits than its factorization.

1020505420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14970 (or 14968 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1020505420 is about 31945.3505224156. The cubic root of 1020505420 is about 1006.7889459130.

Adding to 1020505420 its reverse (245050201), we get a palindrome (1265555621).

The spelling of 1020505420 in words is "one billion, twenty million, five hundred five thousand, four hundred twenty".