20718122458 has 8 divisors (see below), whose sum is σ = 33902382240. Its totient is φ = 9417328380.

The previous prime is 20718122449. The next prime is 20718122471. The reversal of 20718122458 is 85422181702.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20718122458.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470866398 + ... + 470866441.

It is an arithmetic number, because the mean of its divisors is an integer number (4237797780).

Almost surely, 2^20718122458 is an apocalyptic number.

20718122458 is a deficient number, since it is larger than the sum of its proper divisors (13184259782).

20718122458 is a wasteful number, since it uses less digits than its factorization.

20718122458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941732852.

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 20718122458 in words is "twenty billion, seven hundred eighteen million, one hundred twenty-two thousand, four hundred fifty-eight".