20004357141661 has 4 divisors (see below), whose sum is σ = 20005387198524. Its totient is φ = 20003327084800.

The previous prime is 20004357141641. The next prime is 20004357141689. The reversal of 20004357141661 is 16614175340002.

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 19763972857561 + 240384284100 = 4445669^2 + 490290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004357141661 - 2³⁷ = 19866918188189 is a prime.

It is a super-2 number, since 2×20004357141661² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004357141641) 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, 514999300 + ... + 515038141.

It is an arithmetic number, because the mean of its divisors is an integer number (5001346799631).

Almost surely, 2^{20004357141661} is an apocalyptic number.

It is an amenable number.

20004357141661 is a deficient number, since it is larger than the sum of its proper divisors (1030056863).

20004357141661 is a wasteful number, since it uses less digits than its factorization.

20004357141661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030056862.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 20004357141661 in words is "twenty trillion, four billion, three hundred fifty-seven million, one hundred forty-one thousand, six hundred sixty-one".