20540251920166 has 32 divisors (see below), whose sum is σ = 34261046419968. Its totient is φ = 9156158924640.

The previous prime is 20540251920151. The next prime is 20540251920233. The reversal of 20540251920166 is 66102915204502.

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, 1429486 + ... + 6566881.

It is an arithmetic number, because the mean of its divisors is an integer number (1070657700624).

Almost surely, 2^{20540251920166} is an apocalyptic number.

20540251920166 is a deficient number, since it is larger than the sum of its proper divisors (13720794499802).

20540251920166 is a wasteful number, since it uses less digits than its factorization.

20540251920166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7998636.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 20540251920166 in words is "twenty trillion, five hundred forty billion, two hundred fifty-one million, nine hundred twenty thousand, one hundred sixty-six".