20380531459500 has 480 divisors, whose sum is σ = 70778091384000. Its totient is φ = 5090897433600.

The previous prime is 20380531459403. The next prime is 20380531459501. The reversal of 20380531459500 is 595413508302.

20380531459500 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 0 + 53 + 1 + 4 + 595 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20380531459501) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 68336706 + ... + 68634294.

It is an arithmetic number, because the mean of its divisors is an integer number (147454357050).

Almost surely, 2^{20380531459500} is an apocalyptic number.

20380531459500 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 20380531459500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35389045692000).

20380531459500 is an abundant number, since it is smaller than the sum of its proper divisors (50397559924500).

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

20380531459500 is a wasteful number, since it uses less digits than its factorization.

20380531459500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297728 (or 297707 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 20380531459500 in words is "twenty trillion, three hundred eighty billion, five hundred thirty-one million, four hundred fifty-nine thousand, five hundred".