20154132505 has 8 divisors (see below), whose sum is σ = 26045340552. Its totient is φ = 14883051648.

The previous prime is 20154132473. The next prime is 20154132521. The reversal of 20154132505 is 50523145102.

It can be written as a sum of positive squares in 4 ways, for example, as 4613904 + 20149518601 = 2148^2 + 141949^2 .

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 20154132505 - 2⁵ = 20154132473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155031724 + ... + 155031853.

It is an arithmetic number, because the mean of its divisors is an integer number (3255667569).

Almost surely, 2^20154132505 is an apocalyptic number.

It is an amenable number.

20154132505 is a deficient number, since it is larger than the sum of its proper divisors (5891208047).

20154132505 is a wasteful number, since it uses less digits than its factorization.

20154132505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310063595.

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

Adding to 20154132505 its reverse (50523145102), we get a palindrome (70677277607).

The spelling of 20154132505 in words is "twenty billion, one hundred fifty-four million, one hundred thirty-two thousand, five hundred five".