20663123023720 has 16 divisors (see below), whose sum is σ = 46492026803460. Its totient is φ = 8265249209472.

The previous prime is 20663123023717. The next prime is 20663123023727. The reversal of 20663123023720 is 2732032136602.

It can be written as a sum of positive squares in 2 ways, for example, as 19876492389636 + 786630634084 = 4458306^2 + 886922^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20663123023720.

It is not an unprimeable number, because it can be changed into a prime (20663123023727) 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, 258289037757 + ... + 258289037836.

Almost surely, 2^{20663123023720} is an apocalyptic number.

20663123023720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20663123023720 is an abundant number, since it is smaller than the sum of its proper divisors (25828903779740).

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

20663123023720 is a wasteful number, since it uses less digits than its factorization.

20663123023720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516578075604 (or 516578075600 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 37.

The spelling of 20663123023720 in words is "twenty trillion, six hundred sixty-three billion, one hundred twenty-three million, twenty-three thousand, seven hundred twenty".