20724107 has 8 divisors (see below), whose sum is σ = 21364512. Its totient is φ = 20088000.

The previous prime is 20724097. The next prime is 20724161. The reversal of 20724107 is 70142702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20724107 - 2⁴ = 20724091 is a prime.

It is a super-2 number, since 2×20724107² = 858977221894898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20724167) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10607 + ... + 12407.

It is an arithmetic number, because the mean of its divisors is an integer number (2670564).

Almost surely, 2^20724107 is an apocalyptic number.

20724107 is a deficient number, since it is larger than the sum of its proper divisors (640405).

20724107 is a wasteful number, since it uses less digits than its factorization.

20724107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20724107 is about 4552.3737763940. The cubic root of 20724107 is about 274.6788846863.

Adding to 20724107 its reverse (70142702), we get a palindrome (90866809).

The spelling of 20724107 in words is "twenty million, seven hundred twenty-four thousand, one hundred seven".