20284965 has 64 divisors (see below), whose sum is σ = 38707200. Its totient is φ = 10055232.

The previous prime is 20284937. The next prime is 20284973. The reversal of 20284965 is 56948202.

It is a happy number.

It is not a de Polignac number, because 20284965 - 2¹¹ = 20282917 is a prime.

It is a super-2 number, since 2×20284965² = 822959610102450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145866 + ... + 146004.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^20284965 is an apocalyptic number.

It is an amenable number.

20284965 is a deficient number, since it is larger than the sum of its proper divisors (18422235).

20284965 is a wasteful number, since it uses less digits than its factorization.

20284965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20284965 is about 4503.8833244213. The cubic root of 20284965 is about 272.7248767971.

The spelling of 20284965 in words is "twenty million, two hundred eighty-four thousand, nine hundred sixty-five".