20231520234540 has 96 divisors (see below), whose sum is σ = 57585199686336. Its totient is φ = 5305864842240.

The previous prime is 20231520234539. The next prime is 20231520234589. The reversal of 20231520234540 is 4543202513202.

It is a super-2 number, since 2×20231520234540² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 25273474 + ... + 26061686.

It is an arithmetic number, because the mean of its divisors is an integer number (599845830066).

Almost surely, 2^{20231520234540} is an apocalyptic number.

20231520234540 is a gapful number since it is divisible by the number (20) 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 20231520234540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28792599843168).

20231520234540 is an abundant number, since it is smaller than the sum of its proper divisors (37353679451796).

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

20231520234540 is a wasteful number, since it uses less digits than its factorization.

20231520234540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795299 (or 795297 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 20231520234540 its reverse (4543202513202), we get a palindrome (24774722747742).

The spelling of 20231520234540 in words is "twenty trillion, two hundred thirty-one billion, five hundred twenty million, two hundred thirty-four thousand, five hundred forty".