20404124510661 has 12 divisors (see below), whose sum is σ = 29472722323200. Its totient is φ = 13602704429160.

The previous prime is 20404124510519. The next prime is 20404124510669. The reversal of 20404124510661 is 16601542140402.

20404124510661 is a `hidden beast` number, since 2 + 0 + 40 + 41 + 2 + 4 + 510 + 6 + 61 = 666.

It is not a de Polignac number, because 20404124510661 - 2¹⁷ = 20404124379589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404124510669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 790245 + ... + 6436826.

It is an arithmetic number, because the mean of its divisors is an integer number (2456060193600).

Almost surely, 2^{20404124510661} is an apocalyptic number.

It is an amenable number.

20404124510661 is a deficient number, since it is larger than the sum of its proper divisors (9068597812539).

20404124510661 is a wasteful number, since it uses less digits than its factorization.

20404124510661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7540776 (or 7540773 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 20404124510661 in words is "twenty trillion, four hundred four billion, one hundred twenty-four million, five hundred ten thousand, six hundred sixty-one".