1011111020 has 48 divisors (see below), whose sum is σ = 2153844000. Its totient is φ = 398676480.

The previous prime is 1011110999. The next prime is 1011111053. The reversal of 1011111020 is 201111101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1011110989 and 1011111007.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 413000 + ... + 415440.

It is an arithmetic number, because the mean of its divisors is an integer number (44871750).

Almost surely, 2^1011111020 is an apocalyptic number.

1011111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011111020 is an abundant number, since it is smaller than the sum of its proper divisors (1142732980).

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

1011111020 is a wasteful number, since it uses less digits than its factorization.

1011111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738 (or 2736 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1011111020 is about 31797.9719479089. The cubic root of 1011111020 is about 1003.6900401884.

Adding to 1011111020 its reverse (201111101), we get a palindrome (1212222121).

The spelling of 1011111020 in words is "one billion, eleven million, one hundred eleven thousand, twenty".