20707321 has 8 divisors (see below), whose sum is σ = 21864800. Its totient is φ = 19610964.

The previous prime is 20707303. The next prime is 20707327. The reversal of 20707321 is 12370702.

It is not a de Polignac number, because 20707321 - 2⁹ = 20706809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20707292 and 20707301.

It is not an unprimeable number, because it can be changed into a prime (20707327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5350 + ... + 8368.

It is an arithmetic number, because the mean of its divisors is an integer number (2733100).

Almost surely, 2^20707321 is an apocalyptic number.

It is an amenable number.

20707321 is a deficient number, since it is larger than the sum of its proper divisors (1157479).

20707321 is an frugal number, since it uses more digits than its factorization.

20707321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3038 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 20707321 is about 4550.5297493808. The cubic root of 20707321 is about 274.6047036824.

The spelling of 20707321 in words is "twenty million, seven hundred seven thousand, three hundred twenty-one".