20755207 has 8 divisors (see below), whose sum is σ = 22718592. Its totient is φ = 18804600.

The previous prime is 20755199. The next prime is 20755211. The reversal of 20755207 is 70255702.

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 20755207 - 2³ = 20755199 is a prime.

It is a super-2 number, since 2×20755207² = 861557235225698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755297) 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, 388 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (2839824).

Almost surely, 2^20755207 is an apocalyptic number.

20755207 is a deficient number, since it is larger than the sum of its proper divisors (1963385).

20755207 is a wasteful number, since it uses less digits than its factorization.

20755207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6389.

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 20755207 is about 4555.7882962227. The cubic root of 20755207 is about 274.8162165983.

The spelling of 20755207 in words is "twenty million, seven hundred fifty-five thousand, two hundred seven".