20515541553213 has 32 divisors (see below), whose sum is σ = 32625802598400. Its totient is φ = 11211807769536.

The previous prime is 20515541553187. The next prime is 20515541553223. The reversal of 20515541553213 is 31235514551502.

It is not a de Polignac number, because 20515541553213 - 2¹⁰ = 20515541552189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515541553223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141403 + ... + 6407111.

It is an arithmetic number, because the mean of its divisors is an integer number (1019556331200).

Almost surely, 2^{20515541553213} is an apocalyptic number.

20515541553213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20515541553213 is a deficient number, since it is larger than the sum of its proper divisors (12110261045187).

20515541553213 is a wasteful number, since it uses less digits than its factorization.

20515541553213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272521.

The product of its (nonzero) digits is 450000, while the sum is 42.

The spelling of 20515541553213 in words is "twenty trillion, five hundred fifteen billion, five hundred forty-one million, five hundred fifty-three thousand, two hundred thirteen".