20464146512555 has 16 divisors (see below), whose sum is σ = 25020710395200. Its totient is φ = 16062170587008.

The previous prime is 20464146512543. The next prime is 20464146512599. The reversal of 20464146512555 is 55521564146402.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20464146512555 is a prime.

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, 17164754 + ... + 18318216.

It is an arithmetic number, because the mean of its divisors is an integer number (1563794399700).

Almost surely, 2^{20464146512555} is an apocalyptic number.

20464146512555 is a deficient number, since it is larger than the sum of its proper divisors (4556563882645).

20464146512555 is a wasteful number, since it uses less digits than its factorization.

20464146512555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220470.

The product of its (nonzero) digits is 5760000, while the sum is 50.

The spelling of 20464146512555 in words is "twenty trillion, four hundred sixty-four billion, one hundred forty-six million, five hundred twelve thousand, five hundred fifty-five".