20315123605554 has 16 divisors (see below), whose sum is σ = 40842971020800. Its totient is φ = 6736253900240.

The previous prime is 20315123605523. The next prime is 20315123605597. The reversal of 20315123605554 is 45550632151302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8863490829 + ... + 8863493120.

It is an arithmetic number, because the mean of its divisors is an integer number (2552685688800).

Almost surely, 2^{20315123605554} is an apocalyptic number.

20315123605554 is an abundant number, since it is smaller than the sum of its proper divisors (20527847415246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20315123605554 is a wasteful number, since it uses less digits than its factorization.

20315123605554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17726984145.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 20315123605554 its reverse (45550632151302), we get a palindrome (65865755756856).

The spelling of 20315123605554 in words is "twenty trillion, three hundred fifteen billion, one hundred twenty-three million, six hundred five thousand, five hundred fifty-four".