20601511221605 has 8 divisors (see below), whose sum is σ = 26022961543200. Its totient is φ = 15613776925776.

The previous prime is 20601511221563. The next prime is 20601511221631. The reversal of 20601511221605 is 50612211510602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20601511221605 - 2²⁰ = 20601510173029 is a prime.

It is a super-2 number, since 2×20601511221605² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108429006335 + ... + 108429006524.

It is an arithmetic number, because the mean of its divisors is an integer number (3252870192900).

Almost surely, 2^{20601511221605} is an apocalyptic number.

It is an amenable number.

20601511221605 is a deficient number, since it is larger than the sum of its proper divisors (5421450321595).

20601511221605 is a wasteful number, since it uses less digits than its factorization.

20601511221605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216858012883.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 20601511221605 in words is "twenty trillion, six hundred one billion, five hundred eleven million, two hundred twenty-one thousand, six hundred five".