20315111345101 has 4 divisors (see below), whose sum is σ = 20315186471452. Its totient is φ = 20315036218752.

The previous prime is 20315111345047. The next prime is 20315111345107. The reversal of 20315111345101 is 10154311151302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5215281122601 + 15099830222500 = 2283699^2 + 3885850^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315111345101 - 2³¹ = 20312963861453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315111345101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315111345107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37156086 + ... + 37698871.

It is an arithmetic number, because the mean of its divisors is an integer number (5078796617863).

Almost surely, 2^{20315111345101} is an apocalyptic number.

It is an amenable number.

20315111345101 is a deficient number, since it is larger than the sum of its proper divisors (75126351).

20315111345101 is an equidigital number, since it uses as much as digits as its factorization.

20315111345101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75126350.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 20315111345101 its reverse (10154311151302), we get a palindrome (30469422496403).

The spelling of 20315111345101 in words is "twenty trillion, three hundred fifteen billion, one hundred eleven million, three hundred forty-five thousand, one hundred one".