20131704 has 24 divisors (see below), whose sum is σ = 54523560. Its totient is φ = 6710544.

The previous prime is 20131681. The next prime is 20131717. The reversal of 20131704 is 40713102.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139732 + ... + 139875.

It is an arithmetic number, because the mean of its divisors is an integer number (2271815).

Almost surely, 2^20131704 is an apocalyptic number.

20131704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20131704 is an abundant number, since it is smaller than the sum of its proper divisors (34391856).

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

20131704 is a wasteful number, since it uses less digits than its factorization.

20131704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279619 (or 279612 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20131704 is about 4486.8367476430. The cubic root of 20131704 is about 272.0362912938.

Adding to 20131704 its reverse (40713102), we get a palindrome (60844806).

The spelling of 20131704 in words is "twenty million, one hundred thirty-one thousand, seven hundred four".