1023307720920 has 512 divisors, whose sum is σ = 3621252096000. Its totient is φ = 256517015040.

The previous prime is 1023307720909. The next prime is 1023307720921. The reversal of 1023307720920 is 290277033201.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023307720921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 348180811 + ... + 348183749.

It is an arithmetic number, because the mean of its divisors is an integer number (7072758000).

Almost surely, 2^{1023307720920} is an apocalyptic number.

1023307720920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1023307720920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1810626048000).

1023307720920 is an abundant number, since it is smaller than the sum of its proper divisors (2597944375080).

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

1023307720920 is a wasteful number, since it uses less digits than its factorization.

1023307720920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220 (or 3210 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The spelling of 1023307720920 in words is "one trillion, twenty-three billion, three hundred seven million, seven hundred twenty thousand, nine hundred twenty".