1011012020 has 24 divisors (see below), whose sum is σ = 2144150568. Its totient is φ = 400400000.

The previous prime is 1011011999. The next prime is 1011012031. The reversal of 1011012020 is 202101101.

It can be written as a sum of positive squares in 4 ways, for example, as 418284304 + 592727716 = 20452^2 + 24346^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1011011989 and 1011012007.

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, 248231 + ... + 252270.

It is an arithmetic number, because the mean of its divisors is an integer number (89339607).

Almost surely, 2^1011012020 is an apocalyptic number.

1011012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011012020 is an abundant number, since it is smaller than the sum of its proper divisors (1133138548).

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

1011012020 is a wasteful number, since it uses less digits than its factorization.

1011012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500611 (or 500609 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1011012020 is about 31796.4152067493. The cubic root of 1011012020 is about 1003.6572813204.

Adding to 1011012020 its reverse (202101101), we get a palindrome (1213113121).

The spelling of 1011012020 in words is "one billion, eleven million, twelve thousand, twenty".