20731704 has 144 divisors (see below), whose sum is σ = 65096280. Its totient is φ = 5483520.

The previous prime is 20731699. The next prime is 20731727. The reversal of 20731704 is 40713702.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 339834 + ... + 339894.

Almost surely, 2^20731704 is an apocalyptic number.

20731704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20731704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32548140).

20731704 is an abundant number, since it is smaller than the sum of its proper divisors (44364576).

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

20731704 is a wasteful number, since it uses less digits than its factorization.

20731704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20731704 is about 4553.2080997907. The cubic root of 20731704 is about 274.7124443238.

The spelling of 20731704 in words is "twenty million, seven hundred thirty-one thousand, seven hundred four".