20531255506 has 8 divisors (see below), whose sum is σ = 30863689164. Its totient is φ = 10243359120.

The previous prime is 20531255501. The next prime is 20531255533. The reversal of 20531255506 is 60555213502.

It can be written as a sum of positive squares in 2 ways, for example, as 18950000281 + 1581255225 = 137659^2 + 39765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20531255501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11133165 + ... + 11135008.

Almost surely, 2^20531255506 is an apocalyptic number.

20531255506 is a deficient number, since it is larger than the sum of its proper divisors (10332433658).

20531255506 is a wasteful number, since it uses less digits than its factorization.

20531255506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22268636.

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 20531255506 in words is "twenty billion, five hundred thirty-one million, two hundred fifty-five thousand, five hundred six".