20755307 has 6 divisors (see below), whose sum is σ = 21275604. Its totient is φ = 20247440.

The previous prime is 20755303. The next prime is 20755309. The reversal of 20755307 is 70355702.

It is not a de Polignac number, because 20755307 - 2² = 20755303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20755307.

It is not an unprimeable number, because it can be changed into a prime (20755303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4493 + ... + 7854.

It is an arithmetic number, because the mean of its divisors is an integer number (3545934).

Almost surely, 2^20755307 is an apocalyptic number.

20755307 is a deficient number, since it is larger than the sum of its proper divisors (520297).

20755307 is an equidigital number, since it uses as much as digits as its factorization.

20755307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12429 (or 12388 counting only the distinct ones).

The product of its (nonzero) digits is 7350, while the sum is 29.

The square root of 20755307 is about 4555.7992712586. The cubic root of 20755307 is about 274.8166579586.

The spelling of 20755307 in words is "twenty million, seven hundred fifty-five thousand, three hundred seven".