20720307 has 8 divisors (see below), whose sum is σ = 28518400. Its totient is φ = 13367880.

The previous prime is 20720299. The next prime is 20720311. The reversal of 20720307 is 70302702.

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

It is not a de Polignac number, because 20720307 - 2³ = 20720299 is a prime.

It is a super-2 number, since 2×20720307² = 858662244348498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20720327) 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, 111307 + ... + 111492.

It is an arithmetic number, because the mean of its divisors is an integer number (3564800).

Almost surely, 2^20720307 is an apocalyptic number.

20720307 is a deficient number, since it is larger than the sum of its proper divisors (7798093).

20720307 is a wasteful number, since it uses less digits than its factorization.

20720307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222833.

The product of its (nonzero) digits is 588, while the sum is 21.

The square root of 20720307 is about 4551.9563925855. The cubic root of 20720307 is about 274.6620951641.

The spelling of 20720307 in words is "twenty million, seven hundred twenty thousand, three hundred seven".