1000100020 has 24 divisors (see below), whose sum is σ = 2149053984. Its totient is φ = 390736416.

The previous prime is 1000100009. The next prime is 1000100033. The reversal of 1000100020 is 200010001.

1000100020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 1000099982 and 1000100009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580594 + ... + 582313.

It is an arithmetic number, because the mean of its divisors is an integer number (89543916).

Almost surely, 2^1000100020 is an apocalyptic number.

1000100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000100020 is an abundant number, since it is smaller than the sum of its proper divisors (1148953964).

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

1000100020 is a wasteful number, since it uses less digits than its factorization.

1000100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162959 (or 1162957 counting only the distinct ones).

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

The square root of 1000100020 is about 31624.3580171993. The cubic root of 1000100020 is about 1000.0333388885.

Adding to 1000100020 its reverse (200010001), we get a palindrome (1200110021).

The spelling of 1000100020 in words is "one billion, one hundred thousand, twenty".