20533130505 has 64 divisors (see below), whose sum is σ = 37021536000. Its totient is φ = 10796659200.

The previous prime is 20533130503. The next prime is 20533130543. The reversal of 20533130505 is 50503133502.

20533130505 is a `hidden beast` number, since 20 + 5 + 3 + 3 + 130 + 505 = 666.

It is not a de Polignac number, because 20533130505 - 2¹ = 20533130503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20533130503) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2752030 + ... + 2759480.

It is an arithmetic number, because the mean of its divisors is an integer number (578461500).

Almost surely, 2^20533130505 is an apocalyptic number.

It is an amenable number.

20533130505 is a deficient number, since it is larger than the sum of its proper divisors (16488405495).

20533130505 is a wasteful number, since it uses less digits than its factorization.

20533130505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7751 (or 7745 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 27.

The spelling of 20533130505 in words is "twenty billion, five hundred thirty-three million, one hundred thirty thousand, five hundred five".