20031484787 has 4 divisors (see below), whose sum is σ = 21085773480. Its totient is φ = 18977196096.

The previous prime is 20031484771. The next prime is 20031484793. The reversal of 20031484787 is 78748413002.

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 20031484787 - 2⁴ = 20031484771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031484757) 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, 527144318 + ... + 527144355.

It is an arithmetic number, because the mean of its divisors is an integer number (5271443370).

Almost surely, 2^20031484787 is an apocalyptic number.

20031484787 is a deficient number, since it is larger than the sum of its proper divisors (1054288693).

20031484787 is a wasteful number, since it uses less digits than its factorization.

20031484787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054288692.

The product of its (nonzero) digits is 301056, while the sum is 44.

Adding to 20031484787 its reverse (78748413002), we get a palindrome (98779897789).

The spelling of 20031484787 in words is "twenty billion, thirty-one million, four hundred eighty-four thousand, seven hundred eighty-seven".