1011200020 has 12 divisors (see below), whose sum is σ = 2123520084. Its totient is φ = 404480000.

The previous prime is 1011200011. The next prime is 1011200041. The reversal of 1011200020 is 200021101.

It can be written as a sum of positive squares in 2 ways, for example, as 650352004 + 360848016 = 25502^2 + 18996^2 .

It is a super-3 number, since 3×1011200020³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011199976 and 1011200012.

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, 25279981 + ... + 25280020.

It is an arithmetic number, because the mean of its divisors is an integer number (176960007).

Almost surely, 2^1011200020 is an apocalyptic number.

1011200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011200020 is an abundant number, since it is smaller than the sum of its proper divisors (1112320064).

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

1011200020 is a wasteful number, since it uses less digits than its factorization.

1011200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50560010 (or 50560008 counting only the distinct ones).

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

The square root of 1011200020 is about 31799.3713774345. The cubic root of 1011200020 is about 1003.7194882546.

Adding to 1011200020 its reverse (200021101), we get a palindrome (1211221121).

The spelling of 1011200020 in words is "one billion, eleven million, two hundred thousand, twenty".