20323541515555 has 16 divisors (see below), whose sum is σ = 25175137471488. Its totient is φ = 15734248524000.

The previous prime is 20323541515489. The next prime is 20323541515583. The reversal of 20323541515555 is 55551514532302.

It is not a de Polignac number, because 20323541515555 - 2⁴¹ = 18124518260003 is a prime.

It is a Duffinian 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, 28818100 + ... + 29514910.

It is an arithmetic number, because the mean of its divisors is an integer number (1573446091968).

Almost surely, 2^{20323541515555} is an apocalyptic number.

20323541515555 is a deficient number, since it is larger than the sum of its proper divisors (4851595955933).

20323541515555 is a wasteful number, since it uses less digits than its factorization.

20323541515555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885018.

The product of its (nonzero) digits is 2250000, while the sum is 46.

The spelling of 20323541515555 in words is "twenty trillion, three hundred twenty-three billion, five hundred forty-one million, five hundred fifteen thousand, five hundred fifty-five".