20354621511205 has 16 divisors (see below), whose sum is σ = 24588068834304. Its totient is φ = 16175355235200.

The previous prime is 20354621511199. The next prime is 20354621511239. The reversal of 20354621511205 is 50211512645302.

It is not a de Polignac number, because 20354621511205 - 2⁴¹ = 18155598255653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24892417 + ... + 25697113.

It is an arithmetic number, because the mean of its divisors is an integer number (1536754302144).

Almost surely, 2^{20354621511205} is an apocalyptic number.

It is an amenable number.

20354621511205 is a deficient number, since it is larger than the sum of its proper divisors (4233447323099).

20354621511205 is a wasteful number, since it uses less digits than its factorization.

20354621511205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838356.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 20354621511205 in words is "twenty trillion, three hundred fifty-four billion, six hundred twenty-one million, five hundred eleven thousand, two hundred five".