20813525513066 has 48 divisors (see below), whose sum is σ = 38901312895200. Its totient is φ = 8273318914080.

The previous prime is 20813525513063. The next prime is 20813525513069. The reversal of 20813525513066 is 66031552531802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20813525513063) and next prime (20813525513069).

It is a self number, because there is not a number n which added to its sum of digits gives 20813525513066.

It is not an unprimeable number, because it can be changed into a prime (20813525513063) 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, 174042056 + ... + 174161603.

It is an arithmetic number, because the mean of its divisors is an integer number (810444018650).

Almost surely, 2^{20813525513066} is an apocalyptic number.

20813525513066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20813525513066 is a deficient number, since it is larger than the sum of its proper divisors (18087787382134).

20813525513066 is a wasteful number, since it uses less digits than its factorization.

20813525513066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348203715 (or 348203704 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 20813525513066 in words is "twenty trillion, eight hundred thirteen billion, five hundred twenty-five million, five hundred thirteen thousand, sixty-six".