20780087 has 8 divisors (see below), whose sum is σ = 21072480. Its totient is φ = 20489760.

The previous prime is 20780059. The next prime is 20780093. The reversal of 20780087 is 78008702.

It is a happy number.

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 20780087 - 2¹⁰ = 20779063 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 (20780047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33593 + ... + 34205.

It is an arithmetic number, because the mean of its divisors is an integer number (2634060).

Almost surely, 2^20780087 is an apocalyptic number.

20780087 is a deficient number, since it is larger than the sum of its proper divisors (292393).

20780087 is a wasteful number, since it uses less digits than its factorization.

20780087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20780087 is about 4558.5180706015. The cubic root of 20780087 is about 274.9259833859.

Adding to 20780087 its reverse (78008702), we get a palindrome (98788789).

The spelling of 20780087 in words is "twenty million, seven hundred eighty thousand, eighty-seven".