1011320020 has 24 divisors (see below), whose sum is σ = 2124406368. Its totient is φ = 404407200.

The previous prime is 1011319999. The next prime is 1011320039. The reversal of 1011320020 is 200231101.

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 = 1011319979 and 1011320006.

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, 95175 + ... + 105265.

It is an arithmetic number, because the mean of its divisors is an integer number (88516932).

Almost surely, 2^1011320020 is an apocalyptic number.

1011320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011320020 is an abundant number, since it is smaller than the sum of its proper divisors (1113086348).

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

1011320020 is a wasteful number, since it uses less digits than its factorization.

1011320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15111 (or 15109 counting only the distinct ones).

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

The square root of 1011320020 is about 31801.2581512116. The cubic root of 1011320020 is about 1003.7591907770.

Adding to 1011320020 its reverse (200231101), we get a palindrome (1211551121).

The spelling of 1011320020 in words is "one billion, eleven million, three hundred twenty thousand, twenty".