20555121415623 has 8 divisors (see below), whose sum is σ = 27416798310000. Its totient is φ = 13698429399168.

The previous prime is 20555121415607. The next prime is 20555121415627. The reversal of 20555121415623 is 32651412155502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20555121415623 - 2⁴ = 20555121415607 is a prime.

It is a super-2 number, since 2×20555121415623² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555121415627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246209858 + ... + 1246226351.

It is an arithmetic number, because the mean of its divisors is an integer number (3427099788750).

Almost surely, 2^{20555121415623} is an apocalyptic number.

20555121415623 is a deficient number, since it is larger than the sum of its proper divisors (6861676894377).

20555121415623 is a wasteful number, since it uses less digits than its factorization.

20555121415623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492438961.

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 20555121415623 in words is "twenty trillion, five hundred fifty-five billion, one hundred twenty-one million, four hundred fifteen thousand, six hundred twenty-three".