20412799647 has 16 divisors (see below), whose sum is σ = 28185619680. Its totient is φ = 13125257600.

The previous prime is 20412799609. The next prime is 20412799697. The reversal of 20412799647 is 74699721402.

It is a cyclic number.

It is not a de Polignac number, because 20412799647 - 2¹⁸ = 20412537503 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20412799647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412799697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42804 + ... + 206537.

It is an arithmetic number, because the mean of its divisors is an integer number (1761601230).

Almost surely, 2^20412799647 is an apocalyptic number.

20412799647 is a deficient number, since it is larger than the sum of its proper divisors (7772820033).

20412799647 is a wasteful number, since it uses less digits than its factorization.

20412799647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250314.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 20412799647 in words is "twenty billion, four hundred twelve million, seven hundred ninety-nine thousand, six hundred forty-seven".