1011020320 has 24 divisors (see below), whose sum is σ = 2388535884. Its totient is φ = 404408064.

The previous prime is 1011020299. The next prime is 1011020321. The reversal of 1011020320 is 230201101.

It can be written as a sum of positive squares in 2 ways, for example, as 899760016 + 111260304 = 29996^2 + 10548^2 .

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 = 1011020297 and 1011020306.

It is not an unprimeable number, because it can be changed into a prime (1011020321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159279 + ... + 3159598.

Almost surely, 2^1011020320 is an apocalyptic number.

1011020320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011020320 is an abundant number, since it is smaller than the sum of its proper divisors (1377515564).

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

1011020320 is an equidigital number, since it uses as much as digits as its factorization.

1011020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318892 (or 6318884 counting only the distinct ones).

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

The square root of 1011020320 is about 31796.5457243393. The cubic root of 1011020320 is about 1003.6600278531.

Adding to 1011020320 its reverse (230201101), we get a palindrome (1241221421).

The spelling of 1011020320 in words is "one billion, eleven million, twenty thousand, three hundred twenty".