20029281 has 16 divisors (see below), whose sum is σ = 28373184. Its totient is φ = 12524544.

The previous prime is 20029259. The next prime is 20029307. The reversal of 20029281 is 18292002.

It is not a de Polignac number, because 20029281 - 2¹⁰ = 20028257 is a prime.

It is a super-2 number, since 2×20029281² = 802344194753922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20029241) 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 15 ways as a sum of consecutive naturals, for example, 21630 + ... + 22536.

It is an arithmetic number, because the mean of its divisors is an integer number (1773324).

Almost surely, 2^20029281 is an apocalyptic number.

It is an amenable number.

20029281 is a deficient number, since it is larger than the sum of its proper divisors (8343903).

20029281 is a wasteful number, since it uses less digits than its factorization.

20029281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20029281 is about 4475.4084729776. The cubic root of 20029281 is about 271.5741651691.

The spelling of 20029281 in words is "twenty million, twenty-nine thousand, two hundred eighty-one".