20311724 has 6 divisors (see below), whose sum is σ = 35545524. Its totient is φ = 10155860.

The previous prime is 20311723. The next prime is 20311763. The reversal of 20311724 is 42711302.

It is a super-2 number, since 2×20311724² = 825132263704352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20311696 and 20311705.

It is not an unprimeable number, because it can be changed into a prime (20311723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2538962 + ... + 2538969.

It is an arithmetic number, because the mean of its divisors is an integer number (5924254).

Almost surely, 2^20311724 is an apocalyptic number.

It is an amenable number.

20311724 is a deficient number, since it is larger than the sum of its proper divisors (15233800).

20311724 is a wasteful number, since it uses less digits than its factorization.

20311724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5077935 (or 5077933 counting only the distinct ones).

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

The square root of 20311724 is about 4506.8530040373. The cubic root of 20311724 is about 272.8447461738.

The spelling of 20311724 in words is "twenty million, three hundred eleven thousand, seven hundred twenty-four".