20131724 has 12 divisors (see below), whose sum is σ = 35580048. Its totient is φ = 9966000.

The previous prime is 20131717. The next prime is 20131753. The reversal of 20131724 is 42713102.

It is a super-2 number, since 2×20131724² = 810572622424352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20131696 and 20131705.

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 3 ways as a sum of consecutive naturals, for example, 24512 + ... + 25319.

It is an arithmetic number, because the mean of its divisors is an integer number (2965004).

Almost surely, 2^20131724 is an apocalyptic number.

It is an amenable number.

20131724 is a deficient number, since it is larger than the sum of its proper divisors (15448324).

20131724 is a wasteful number, since it uses less digits than its factorization.

20131724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49936 (or 49934 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20131724 is about 4486.8389763842. The cubic root of 20131724 is about 272.0363813793.

Adding to 20131724 its reverse (42713102), we get a palindrome (62844826).

The spelling of 20131724 in words is "twenty million, one hundred thirty-one thousand, seven hundred twenty-four".