1000120020 has 48 divisors (see below), whose sum is σ = 2809392768. Its totient is φ = 265836160.

The previous prime is 1000120007. The next prime is 1000120021. The reversal of 1000120020 is 200210001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 1000119990 and 1000120008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000120021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8139 + ... + 45458.

It is an arithmetic number, because the mean of its divisors is an integer number (58529016).

Almost surely, 2^1000120020 is an apocalyptic number.

1000120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000120020 is an abundant number, since it is smaller than the sum of its proper divisors (1809272748).

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

1000120020 is a wasteful number, since it uses less digits than its factorization.

1000120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53920 (or 53918 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1000120020 is about 31624.6742275711. The cubic root of 1000120020 is about 1000.0400050662.

Adding to 1000120020 its reverse (200210001), we get a palindrome (1200330021).

The spelling of 1000120020 in words is "one billion, one hundred twenty thousand, twenty".