1013021020 has 24 divisors (see below), whose sum is σ = 2320739568. Its totient is φ = 368371200.

The previous prime is 1013021003. The next prime is 1013021021. The reversal of 1013021020 is 201203101.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1013020988 and 1013021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302101 + ... + 2302540.

It is an arithmetic number, because the mean of its divisors is an integer number (96697482).

Almost surely, 2^1013021020 is an apocalyptic number.

1013021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1013021020 is an abundant number, since it is smaller than the sum of its proper divisors (1307718548).

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

1013021020 is a wasteful number, since it uses less digits than its factorization.

1013021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604661 (or 4604659 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1013021020 is about 31827.9911398756. The cubic root of 1013021020 is about 1004.3216365531.

Adding to 1013021020 its reverse (201203101), we get a palindrome (1214224121).

The spelling of 1013021020 in words is "one billion, thirteen million, twenty-one thousand, twenty".