20143770571 has 6 divisors (see below), whose sum is σ = 20298730916. Its totient is φ = 19989984300.

The previous prime is 20143770551. The next prime is 20143770659. The reversal of 20143770571 is 17507734102.

It is a happy number.

It is not a de Polignac number, because 20143770571 - 2⁷ = 20143770443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20143770571.

It is not an unprimeable number, because it can be changed into a prime (20143770541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 569745 + ... + 604066.

Almost surely, 2^20143770571 is an apocalyptic number.

20143770571 is a deficient number, since it is larger than the sum of its proper divisors (154960345).

20143770571 is an equidigital number, since it uses as much as digits as its factorization.

20143770571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174073 (or 1173942 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The spelling of 20143770571 in words is "twenty billion, one hundred forty-three million, seven hundred seventy thousand, five hundred seventy-one".