1020020020 has 12 divisors (see below), whose sum is σ = 2142042084. Its totient is φ = 408008000.

The previous prime is 1020019969. The next prime is 1020020041. The reversal of 1020020020 is 200200201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 695587876 + 324432144 = 26374^2 + 18012^2 .

1020020020 is a modest number, since divided by 20020 gives 1020 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1020019985 and 1020020012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25500481 + ... + 25500520.

It is an arithmetic number, because the mean of its divisors is an integer number (178503507).

Almost surely, 2^1020020020 is an apocalyptic number.

1020020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020020020 is an abundant number, since it is smaller than the sum of its proper divisors (1122022064).

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

1020020020 is a wasteful number, since it uses less digits than its factorization.

1020020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51001010 (or 51001008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 1020020020 is about 31937.7522690624. The cubic root of 1020020020 is about 1006.6292953297.

Adding to 1020020020 its reverse (200200201), we get a palindrome (1220220221).

The spelling of 1020020020 in words is "one billion, twenty million, twenty thousand, twenty".