20161620605 has 32 divisors (see below), whose sum is σ = 28977158400. Its totient is φ = 13451417280.

The previous prime is 20161620599. The next prime is 20161620641. The reversal of 20161620605 is 50602616102.

It is not a de Polignac number, because 20161620605 - 2⁶ = 20161620541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95411 + ... + 222320.

It is an arithmetic number, because the mean of its divisors is an integer number (905536200).

Almost surely, 2^20161620605 is an apocalyptic number.

It is an amenable number.

20161620605 is a deficient number, since it is larger than the sum of its proper divisors (8815537795).

20161620605 is an equidigital number, since it uses as much as digits as its factorization.

20161620605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317794 (or 317780 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 20161620605 in words is "twenty billion, one hundred sixty-one million, six hundred twenty thousand, six hundred five".