20913115563396 has 81 divisors (see below), whose sum is σ = 61495083164151. Its totient is φ = 5975120998224.

The previous prime is 20913115563367. The next prime is 20913115563397. The reversal of 20913115563396 is 69336551131902.

The square root of 20913115563396 is 4573086.

It is a perfect power (a square), and thus also a powerful number.

20913115563396 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 31 + 15 + 563 + 39 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (20913115563397) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 192015171 + ... + 192124053.

Almost surely, 2^{20913115563396} is an apocalyptic number.

20913115563396 is the 4573086-th square number.

It is an amenable number.

20913115563396 is an abundant number, since it is smaller than the sum of its proper divisors (40581967600755).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20913115563396 is an frugal number, since it uses more digits than its factorization.

20913115563396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217790 (or 108895 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 54.

The spelling of 20913115563396 in words is "twenty trillion, nine hundred thirteen billion, one hundred fifteen million, five hundred sixty-three thousand, three hundred ninety-six".