20853010502505 has 24 divisors (see below), whose sum is σ = 37483929991872. Its totient is φ = 11121605600688.

The previous prime is 20853010502501. The next prime is 20853010502573. The reversal of 20853010502505 is 50520501035802.

20853010502505 is a `hidden beast` number, since 20 + 8 + 530 + 1 + 0 + 50 + 2 + 50 + 5 = 666.

It is not a de Polignac number, because 20853010502505 - 2² = 20853010502501 is a prime.

It is a super-2 number, since 2×20853010502505² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20853010502505.

It is not an unprimeable number, because it can be changed into a prime (20853010502501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8581484589 + ... + 8581487018.

It is an arithmetic number, because the mean of its divisors is an integer number (1561830416328).

Almost surely, 2^{20853010502505} is an apocalyptic number.

It is an amenable number.

20853010502505 is a deficient number, since it is larger than the sum of its proper divisors (16630919489367).

20853010502505 is an equidigital number, since it uses as much as digits as its factorization.

20853010502505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17162971627 (or 17162971615 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 20853010502505 in words is "twenty trillion, eight hundred fifty-three billion, ten million, five hundred two thousand, five hundred five".