1010000020 has 12 divisors (see below), whose sum is σ = 2121000084. Its totient is φ = 404000000.

The previous prime is 1010000011. The next prime is 1010000021. The reversal of 1010000020 is 200000101.

It can be written as a sum of positive squares in 2 ways, for example, as 232928644 + 777071376 = 15262^2 + 27876^2 .

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a junction number, because it is equal to n+sod(n) for n = 1009999964 and 1010000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010000021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25249981 + ... + 25250020.

It is an arithmetic number, because the mean of its divisors is an integer number (176750007).

Almost surely, 2^1010000020 is an apocalyptic number.

1010000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1010000020 is an abundant number, since it is smaller than the sum of its proper divisors (1111000064).

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

1010000020 is a wasteful number, since it uses less digits than its factorization.

1010000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50500010 (or 50500008 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 1010000020 is about 31780.4974787998. The cubic root of 1010000020 is about 1003.3222901647.

Adding to 1010000020 its reverse (200000101), we get a palindrome (1210000121).

The spelling of 1010000020 in words is "one billion, ten million, twenty", and thus it is an aban number and an uban number.