20671616655015 has 32 divisors (see below), whose sum is σ = 35023406558976. Its totient is φ = 10375376171520.

The previous prime is 20671616654971. The next prime is 20671616655023. The reversal of 20671616655015 is 51055661617602.

It is not a de Polignac number, because 20671616655015 - 2⁶ = 20671616654951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016517 + ... + 6509726.

It is an arithmetic number, because the mean of its divisors is an integer number (1094481454968).

Almost surely, 2^{20671616655015} is an apocalyptic number.

20671616655015 is a deficient number, since it is larger than the sum of its proper divisors (14351789903961).

20671616655015 is a wasteful number, since it uses less digits than its factorization.

20671616655015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7537039.

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 20671616655015 in words is "twenty trillion, six hundred seventy-one billion, six hundred sixteen million, six hundred fifty-five thousand, fifteen".