20287734 has 32 divisors (see below), whose sum is σ = 41648640. Its totient is φ = 6586272.

The previous prime is 20287723. The next prime is 20287739. The reversal of 20287734 is 43778202.

It is a junction number, because it is equal to n+sod(n) for n = 20287695 and 20287704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287739) 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, 43587 + ... + 44049.

It is an arithmetic number, because the mean of its divisors is an integer number (1301520).

Almost surely, 2^20287734 is an apocalyptic number.

20287734 is an abundant number, since it is smaller than the sum of its proper divisors (21360906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20287734 is a wasteful number, since it uses less digits than its factorization.

20287734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20287734 is about 4504.1907153228. The cubic root of 20287734 is about 272.7372856728.

The spelling of 20287734 in words is "twenty million, two hundred eighty-seven thousand, seven hundred thirty-four".