20447178458 has 16 divisors (see below), whose sum is σ = 35070319104. Its totient is φ = 8758573200.

The previous prime is 20447178419. The next prime is 20447178461. The reversal of 20447178458 is 85487174402.

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, 346985 + ... + 401612.

It is an arithmetic number, because the mean of its divisors is an integer number (2191894944).

Almost surely, 2^20447178458 is an apocalyptic number.

20447178458 is a deficient number, since it is larger than the sum of its proper divisors (14623140646).

20447178458 is a wasteful number, since it uses less digits than its factorization.

20447178458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750557.

The product of its (nonzero) digits is 2007040, while the sum is 50.

The spelling of 20447178458 in words is "twenty billion, four hundred forty-seven million, one hundred seventy-eight thousand, four hundred fifty-eight".