20287234 has 32 divisors (see below), whose sum is σ = 34338816. Its totient is φ = 8910720.

The previous prime is 20287207. The next prime is 20287243. The reversal of 20287234 is 43278202.

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 15 ways as a sum of consecutive naturals, for example, 148014 + ... + 148150.

It is an arithmetic number, because the mean of its divisors is an integer number (1073088).

Almost surely, 2^20287234 is an apocalyptic number.

20287234 is a deficient number, since it is larger than the sum of its proper divisors (14051582).

20287234 is a wasteful number, since it uses less digits than its factorization.

20287234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20287234 is about 4504.1352111143. The cubic root of 20287234 is about 272.7350450782.

The spelling of 20287234 in words is "twenty million, two hundred eighty-seven thousand, two hundred thirty-four".