20724664201447 has 4 divisors (see below), whose sum is σ = 20724683961160. Its totient is φ = 20724644441736.

The previous prime is 20724664201441. The next prime is 20724664201453. The reversal of 20724664201447 is 74410246642702.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20724664201441) and next prime (20724664201453).

It is a cyclic number.

It is not a de Polignac number, because 20724664201447 - 2¹⁵ = 20724664168679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20724664201447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724664201441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8212848 + ... + 10435525.

It is an arithmetic number, because the mean of its divisors is an integer number (5181170990290).

Almost surely, 2^{20724664201447} is an apocalyptic number.

20724664201447 is a deficient number, since it is larger than the sum of its proper divisors (19759713).

20724664201447 is a wasteful number, since it uses less digits than its factorization.

20724664201447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19759712.

The product of its (nonzero) digits is 3612672, while the sum is 49.

The spelling of 20724664201447 in words is "twenty trillion, seven hundred twenty-four billion, six hundred sixty-four million, two hundred one thousand, four hundred forty-seven".