20571155662057 has 64 divisors (see below), whose sum is σ = 29348064958464. Its totient is φ = 13876845143040.

The previous prime is 20571155662039. The next prime is 20571155662061. The reversal of 20571155662057 is 75026655117502.

It is a happy number.

It is not a de Polignac number, because 20571155662057 - 2³⁵ = 20536795923689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20571155661995 and 20571155662013.

It is not an unprimeable number, because it can be changed into a prime (20571155660057) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2680018 + ... + 6951604.

It is an arithmetic number, because the mean of its divisors is an integer number (458563514976).

Almost surely, 2^{20571155662057} is an apocalyptic number.

It is an amenable number.

20571155662057 is a deficient number, since it is larger than the sum of its proper divisors (8776909296407).

20571155662057 is a wasteful number, since it uses less digits than its factorization.

20571155662057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271918.

The product of its (nonzero) digits is 4410000, while the sum is 52.

Subtracting 20571155662057 from its reverse (75026655117502), we obtain a palindrome (54455499455445).

It can be divided in two parts, 20571155 and 662057, that added together give a palindrome (21233212).

The spelling of 20571155662057 in words is "twenty trillion, five hundred seventy-one billion, one hundred fifty-five million, six hundred sixty-two thousand, fifty-seven".