1020320231220 has 144 divisors (see below), whose sum is σ = 3103349034240. Its totient is φ = 271349960448.

The previous prime is 1020320231197. The next prime is 1020320231239. The reversal of 1020320231220 is 221320230201.

1020320231220 is a `hidden beast` number, since 10 + 2 + 0 + 320 + 2 + 312 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1020320231193 and 1020320231202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107025574 + ... + 107035106.

It is an arithmetic number, because the mean of its divisors is an integer number (21551034960).

Almost surely, 2^{1020320231220} is an apocalyptic number.

1020320231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020320231220 is an abundant number, since it is smaller than the sum of its proper divisors (2083028803020).

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

1020320231220 is a wasteful number, since it uses less digits than its factorization.

1020320231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11094 (or 11089 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 1020320231220 its reverse (221320230201), we get a palindrome (1241640461421).

The spelling of 1020320231220 in words is "one trillion, twenty billion, three hundred twenty million, two hundred thirty-one thousand, two hundred twenty".