20345023545520 has 20 divisors (see below), whose sum is σ = 47302179743520. Its totient is φ = 8138009418176.

The previous prime is 20345023545493. The next prime is 20345023545527. The reversal of 20345023545520 is 2554532054302.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (20345023545527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127156397080 + ... + 127156397239.

It is an arithmetic number, because the mean of its divisors is an integer number (2365108987176).

Almost surely, 2^{20345023545520} is an apocalyptic number.

20345023545520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345023545520 is an abundant number, since it is smaller than the sum of its proper divisors (26957156198000).

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

20345023545520 is a wasteful number, since it uses less digits than its factorization.

20345023545520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254312794332 (or 254312794326 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 40.

Adding to 20345023545520 its reverse (2554532054302), we get a palindrome (22899555599822).

The spelling of 20345023545520 in words is "twenty trillion, three hundred forty-five billion, twenty-three million, five hundred forty-five thousand, five hundred twenty".