20028520571 has 2 divisors, whose sum is σ = 20028520572. Its totient is φ = 20028520570.

The previous prime is 20028520553. The next prime is 20028520613. The reversal of 20028520571 is 17502582002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20028520571 - 2⁶ = 20028520507 is a prime.

It is a super-2 number, since 2×20028520571² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20028520511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014260285 + 10014260286.

It is an arithmetic number, because the mean of its divisors is an integer number (10014260286).

Almost surely, 2^20028520571 is an apocalyptic number.

20028520571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20028520571 is an equidigital number, since it uses as much as digits as its factorization.

20028520571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The spelling of 20028520571 in words is "twenty billion, twenty-eight million, five hundred twenty thousand, five hundred seventy-one".