20506645120615 has 16 divisors (see below), whose sum is σ = 24640117367040. Its totient is φ = 16383895770880.

The previous prime is 20506645120597. The next prime is 20506645120631. The reversal of 20506645120615 is 51602154660502.

It is not a de Polignac number, because 20506645120615 - 2¹¹ = 20506645118567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18889491 + ... + 19945579.

It is an arithmetic number, because the mean of its divisors is an integer number (1540007335440).

Almost surely, 2^{20506645120615} is an apocalyptic number.

20506645120615 is a deficient number, since it is larger than the sum of its proper divisors (4133472246425).

20506645120615 is a wasteful number, since it uses less digits than its factorization.

20506645120615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061162.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 20506645120615 in words is "twenty trillion, five hundred six billion, six hundred forty-five million, one hundred twenty thousand, six hundred fifteen".