20020145517 has 8 divisors (see below), whose sum is σ = 29659474880. Its totient is φ = 13346763660.

The previous prime is 20020145491. The next prime is 20020145531. The reversal of 20020145517 is 71554102002.

20020145517 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 0 + 145 + 517 = 666.

It is not a de Polignac number, because 20020145517 - 2¹⁹ = 20019621229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 741486871 = 20020145517 / (2 + 0 + 0 + 2 + 0 + 1 + 4 + 5 + 5 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020145597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370743409 + ... + 370743462.

It is an arithmetic number, because the mean of its divisors is an integer number (3707434360).

Almost surely, 2^20020145517 is an apocalyptic number.

20020145517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20020145517 is a deficient number, since it is larger than the sum of its proper divisors (9639329363).

20020145517 is an equidigital number, since it uses as much as digits as its factorization.

20020145517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741486880 (or 741486874 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

Adding to 20020145517 its reverse (71554102002), we get a palindrome (91574247519).

The spelling of 20020145517 in words is "twenty billion, twenty million, one hundred forty-five thousand, five hundred seventeen".