20129268287 has 8 divisors (see below), whose sum is σ = 21305771760. Its totient is φ = 18964471680.

The previous prime is 20129268281. The next prime is 20129268293. The reversal of 20129268287 is 78286292102.

It is an interprime number because it is at equal distance from previous prime (20129268281) and next prime (20129268293).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20129268287 - 2¹⁸ = 20129006143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129268281) 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 7 ways as a sum of consecutive naturals, for example, 2923178 + ... + 2930055.

It is an arithmetic number, because the mean of its divisors is an integer number (2663221470).

Almost surely, 2^20129268287 is an apocalyptic number.

20129268287 is a deficient number, since it is larger than the sum of its proper divisors (1176503473).

20129268287 is a wasteful number, since it uses less digits than its factorization.

20129268287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853433.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 20129268287 in words is "twenty billion, one hundred twenty-nine million, two hundred sixty-eight thousand, two hundred eighty-seven".