1012100020 has 12 divisors (see below), whose sum is σ = 2125410084. Its totient is φ = 404840000.

The previous prime is 1012100009. The next prime is 1012100039. The reversal of 1012100020 is 200012101.

It can be written as a sum of positive squares in 2 ways, for example, as 403688464 + 608411556 = 20092^2 + 24666^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1012099976 and 1012100012.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25302481 + ... + 25302520.

It is an arithmetic number, because the mean of its divisors is an integer number (177117507).

Almost surely, 2^1012100020 is an apocalyptic number.

1012100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012100020 is an abundant number, since it is smaller than the sum of its proper divisors (1113310064).

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

1012100020 is a wasteful number, since it uses less digits than its factorization.

1012100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50605010 (or 50605008 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1012100020 is about 31813.5194532136. The cubic root of 1012100020 is about 1004.0171806502.

Adding to 1012100020 its reverse (200012101), we get a palindrome (1212112121).

The spelling of 1012100020 in words is "one billion, twelve million, one hundred thousand, twenty".