20715724 has 12 divisors (see below), whose sum is σ = 38385144. Its totient is φ = 9748544.

The previous prime is 20715713. The next prime is 20715731. The reversal of 20715724 is 42751702.

It is a junction number, because it is equal to n+sod(n) for n = 20715692 and 20715701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152254 + ... + 152389.

It is an arithmetic number, because the mean of its divisors is an integer number (3198762).

Almost surely, 2^20715724 is an apocalyptic number.

It is an amenable number.

20715724 is a deficient number, since it is larger than the sum of its proper divisors (17669420).

20715724 is a wasteful number, since it uses less digits than its factorization.

20715724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304664 (or 304662 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20715724 is about 4551.4529548266. The cubic root of 20715724 is about 274.6418433856.

It can be divided in two parts, 207 and 15724, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 20715724 in words is "twenty million, seven hundred fifteen thousand, seven hundred twenty-four".