1011001320020 has 24 divisors (see below), whose sum is σ = 2130767414664. Its totient is φ = 402940596096.

The previous prime is 1011001319941. The next prime is 1011001320053. The reversal of 1011001320020 is 200231001101.

It can be written as a sum of positive squares in 4 ways, for example, as 144847225744 + 866154094276 = 380588^2 + 930674^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1011001319983 and 1011001320010.

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, 91240067 + ... + 91251146.

It is an arithmetic number, because the mean of its divisors is an integer number (88781975611).

Almost surely, 2^{1011001320020} is an apocalyptic number.

1011001320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011001320020 is an abundant number, since it is smaller than the sum of its proper divisors (1119766094644).

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

1011001320020 is a wasteful number, since it uses less digits than its factorization.

1011001320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182491499 (or 182491497 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 1011001320020 its reverse (200231001101), we get a palindrome (1211232321121).

The spelling of 1011001320020 in words is "one trillion, eleven billion, one million, three hundred twenty thousand, twenty".