20531154205 has 8 divisors (see below), whose sum is σ = 24658043832. Its totient is φ = 16411150848.

The previous prime is 20531154191. The next prime is 20531154209. The reversal of 20531154205 is 50245113502.

It can be written as a sum of positive squares in 4 ways, for example, as 4002966361 + 16528187844 = 63269^2 + 128562^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20531154205 - 2⁵ = 20531154173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531154209) 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, 1715004 + ... + 1726933.

It is an arithmetic number, because the mean of its divisors is an integer number (3082255479).

Almost surely, 2^20531154205 is an apocalyptic number.

It is an amenable number.

20531154205 is a deficient number, since it is larger than the sum of its proper divisors (4126889627).

20531154205 is a wasteful number, since it uses less digits than its factorization.

20531154205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443135.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 20531154205 its reverse (50245113502), we get a palindrome (70776267707).

The spelling of 20531154205 in words is "twenty billion, five hundred thirty-one million, one hundred fifty-four thousand, two hundred five".