20315101545155 has 4 divisors (see below), whose sum is σ = 24378121854192. Its totient is φ = 16252081236120.

The previous prime is 20315101545127. The next prime is 20315101545161. The reversal of 20315101545155 is 55154510151302.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20315101545155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031510154511 + ... + 2031510154520.

It is an arithmetic number, because the mean of its divisors is an integer number (6094530463548).

Almost surely, 2^{20315101545155} is an apocalyptic number.

20315101545155 is a deficient number, since it is larger than the sum of its proper divisors (4063020309037).

20315101545155 is an equidigital number, since it uses as much as digits as its factorization.

20315101545155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063020309036.

The product of its (nonzero) digits is 75000, while the sum is 38.

Adding to 20315101545155 its reverse (55154510151302), we get a palindrome (75469611696457).

The spelling of 20315101545155 in words is "twenty trillion, three hundred fifteen billion, one hundred one million, five hundred forty-five thousand, one hundred fifty-five".