20254547647 has 4 divisors (see below), whose sum is σ = 20255857600. Its totient is φ = 20253237696.

The previous prime is 20254547639. The next prime is 20254547653. The reversal of 20254547647 is 74674545202.

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

It is a cyclic number.

It is not a de Polignac number, because 20254547647 - 2³ = 20254547639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20254547597 and 20254547606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20254547147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631503 + ... + 662800.

It is an arithmetic number, because the mean of its divisors is an integer number (5063964400).

Almost surely, 2^20254547647 is an apocalyptic number.

20254547647 is a deficient number, since it is larger than the sum of its proper divisors (1309953).

20254547647 is a wasteful number, since it uses less digits than its factorization.

20254547647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309952.

The product of its (nonzero) digits is 1881600, while the sum is 46.

The spelling of 20254547647 in words is "twenty billion, two hundred fifty-four million, five hundred forty-seven thousand, six hundred forty-seven".