20284978047 has 4 divisors (see below), whose sum is σ = 27046637400. Its totient is φ = 13523318696.

The previous prime is 20284977991. The next prime is 20284978057. The reversal of 20284978047 is 74087948202.

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 20284978047 - 2¹⁵ = 20284945279 is a prime.

It is a super-2 number, since 2×20284978047² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284978057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3380829672 + ... + 3380829677.

It is an arithmetic number, because the mean of its divisors is an integer number (6761659350).

Almost surely, 2^20284978047 is an apocalyptic number.

20284978047 is a deficient number, since it is larger than the sum of its proper divisors (6761659353).

20284978047 is an equidigital number, since it uses as much as digits as its factorization.

20284978047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761659352.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 20284978047 in words is "twenty billion, two hundred eighty-four million, nine hundred seventy-eight thousand, forty-seven".