20766175743461 has 4 divisors (see below), whose sum is σ = 20798572274124. Its totient is φ = 20733779212800.

The previous prime is 20766175743449. The next prime is 20766175743487. The reversal of 20766175743461 is 16434757166702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12974987530561 + 7791188212900 = 3602081^2 + 2791270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20766175743461 - 2²⁶ = 20766108634597 is a prime.

It is a super-4 number, since 4×20766175743461⁴ (a number of 54 digits) contains 4444 as substring.

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 20766175743461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766175743431) 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, 16198264370 + ... + 16198265651.

It is an arithmetic number, because the mean of its divisors is an integer number (5199643068531).

Almost surely, 2^{20766175743461} is an apocalyptic number.

It is an amenable number.

20766175743461 is a deficient number, since it is larger than the sum of its proper divisors (32396530663).

20766175743461 is an equidigital number, since it uses as much as digits as its factorization.

20766175743461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32396530662.

The product of its (nonzero) digits is 35562240, while the sum is 59.

The spelling of 20766175743461 in words is "twenty trillion, seven hundred sixty-six billion, one hundred seventy-five million, seven hundred forty-three thousand, four hundred sixty-one".