20623136555515 has 16 divisors (see below), whose sum is σ = 26658099540576. Its totient is φ = 15225586560000.

The previous prime is 20623136555503. The next prime is 20623136555587. The reversal of 20623136555515 is 51555563132602.

It is not a de Polignac number, because 20623136555515 - 2¹⁹ = 20623136031227 is a prime.

It is a super-2 number, since 2×20623136555515² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 39389901 + ... + 39910030.

It is an arithmetic number, because the mean of its divisors is an integer number (1666131221286).

Almost surely, 2^{20623136555515} is an apocalyptic number.

20623136555515 is a deficient number, since it is larger than the sum of its proper divisors (6034962985061).

20623136555515 is a wasteful number, since it uses less digits than its factorization.

20623136555515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79303950.

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 20623136555515 in words is "twenty trillion, six hundred twenty-three billion, one hundred thirty-six million, five hundred fifty-five thousand, five hundred fifteen".