20315111421554 has 4 divisors (see below), whose sum is σ = 30472667132334. Its totient is φ = 10157555710776.

The previous prime is 20315111421401. The next prime is 20315111421569. The reversal of 20315111421554 is 45512411151302.

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 only one way, i.e., 14203966504225 + 6111144917329 = 3768815^2 + 2472073^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078777855387 + ... + 5078777855390.

Almost surely, 2^{20315111421554} is an apocalyptic number.

20315111421554 is a deficient number, since it is larger than the sum of its proper divisors (10157555710780).

20315111421554 is a wasteful number, since it uses less digits than its factorization.

20315111421554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157555710779.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 20315111421554 its reverse (45512411151302), we get a palindrome (65827522572856).

The spelling of 20315111421554 in words is "twenty trillion, three hundred fifteen billion, one hundred eleven million, four hundred twenty-one thousand, five hundred fifty-four".