20545115130556 has 24 divisors (see below), whose sum is σ = 36012278952720. Its totient is φ = 10255900741632.

The previous prime is 20545115130523. The next prime is 20545115130557. The reversal of 20545115130556 is 65503151154502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545115130557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9061131 + ... + 11099293.

It is an arithmetic number, because the mean of its divisors is an integer number (1500511623030).

Almost surely, 2^{20545115130556} is an apocalyptic number.

It is an amenable number.

20545115130556 is a deficient number, since it is larger than the sum of its proper divisors (15467163822164).

20545115130556 is a wasteful number, since it uses less digits than its factorization.

20545115130556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042253 (or 2042251 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 20545115130556 in words is "twenty trillion, five hundred forty-five billion, one hundred fifteen million, one hundred thirty thousand, five hundred fifty-six".