20617132458 has 64 divisors (see below), whose sum is σ = 46690761600. Its totient is φ = 6024533760.

The previous prime is 20617132441. The next prime is 20617132463. The reversal of 20617132458 is 85423171602.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63273 + ... + 212691.

It is an arithmetic number, because the mean of its divisors is an integer number (729543150).

Almost surely, 2^20617132458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20617132458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23345380800).

20617132458 is an abundant number, since it is smaller than the sum of its proper divisors (26073629142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20617132458 is a wasteful number, since it uses less digits than its factorization.

20617132458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149527.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 20617132458 in words is "twenty billion, six hundred seventeen million, one hundred thirty-two thousand, four hundred fifty-eight".