20025505771 has 4 divisors (see below), whose sum is σ = 20053751200. Its totient is φ = 19997260344.

The previous prime is 20025505769. The next prime is 20025505783. The reversal of 20025505771 is 17750552002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20025505771 - 2¹ = 20025505769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20025505751) 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, 14121651 + ... + 14123068.

It is an arithmetic number, because the mean of its divisors is an integer number (5013437800).

Almost surely, 2^20025505771 is an apocalyptic number.

20025505771 is a deficient number, since it is larger than the sum of its proper divisors (28245429).

20025505771 is an equidigital number, since it uses as much as digits as its factorization.

20025505771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28245428.

The product of its (nonzero) digits is 24500, while the sum is 34.

The spelling of 20025505771 in words is "twenty billion, twenty-five million, five hundred five thousand, seven hundred seventy-one".