20491201447 has 16 divisors (see below), whose sum is σ = 21828102912. Its totient is φ = 19169113600.

The previous prime is 20491201439. The next prime is 20491201459. The reversal of 20491201447 is 74410219402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20491201447 - 2³ = 20491201439 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 (20491201417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4354698 + ... + 4359400.

It is an arithmetic number, because the mean of its divisors is an integer number (1364256432).

Almost surely, 2^20491201447 is an apocalyptic number.

20491201447 is a deficient number, since it is larger than the sum of its proper divisors (1336901465).

20491201447 is a wasteful number, since it uses less digits than its factorization.

20491201447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 20491201447 in words is "twenty billion, four hundred ninety-one million, two hundred one thousand, four hundred forty-seven".