20284959 has 8 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 13499096.

The previous prime is 20284937. The next prime is 20284973. The reversal of 20284959 is 95948202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20284959 is a prime.

It is a super-2 number, since 2×20284959² = 822959123263362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20284559) 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, 3999 + ... + 7520.

It is an arithmetic number, because the mean of its divisors is an integer number (3386880).

Almost surely, 2^20284959 is an apocalyptic number.

20284959 is a deficient number, since it is larger than the sum of its proper divisors (6810081).

20284959 is a wasteful number, since it uses less digits than its factorization.

20284959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12109.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 20284959 is about 4503.8826583294. The cubic root of 20284959 is about 272.7248499078.

The spelling of 20284959 in words is "twenty million, two hundred eighty-four thousand, nine hundred fifty-nine".