20530521155 has 32 divisors (see below), whose sum is σ = 27568719360. Its totient is φ = 14586048000.

The previous prime is 20530521131. The next prime is 20530521173. The reversal of 20530521155 is 55112503502.

It is a de Polignac number, because none of the positive numbers 2^k-20530521155 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380042 + ... + 430688.

It is an arithmetic number, because the mean of its divisors is an integer number (861522480).

Almost surely, 2^20530521155 is an apocalyptic number.

20530521155 is a deficient number, since it is larger than the sum of its proper divisors (7038198205).

20530521155 is a wasteful number, since it uses less digits than its factorization.

20530521155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50939.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 20530521155 in words is "twenty billion, five hundred thirty million, five hundred twenty-one thousand, one hundred fifty-five".