1023120520 has 32 divisors (see below), whose sum is σ = 2437435800. Its totient is φ = 385174528.

The previous prime is 1023120517. The next prime is 1023120541. The reversal of 1023120520 is 250213201.

It can be written as a sum of positive squares in 4 ways, for example, as 924038404 + 99082116 = 30398^2 + 9954^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1023120494 and 1023120503.

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, 751615 + ... + 752974.

Almost surely, 2^1023120520 is an apocalyptic number.

1023120520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023120520 is an abundant number, since it is smaller than the sum of its proper divisors (1414315280).

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

1023120520 is a wasteful number, since it uses less digits than its factorization.

1023120520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504617 (or 1504613 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1023120520 is about 31986.2551731208. The cubic root of 1023120520 is about 1007.6481959716.

Adding to 1023120520 its reverse (250213201), we get a palindrome (1273333721).

The spelling of 1023120520 in words is "one billion, twenty-three million, one hundred twenty thousand, five hundred twenty".