20752705 has 8 divisors (see below), whose sum is σ = 24928704. Its totient is φ = 16585200.

The previous prime is 20752691. The next prime is 20752727. The reversal of 20752705 is 50725702.

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

It is not a de Polignac number, because 20752705 - 2¹³ = 20744513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6300 + ... + 9010.

It is an arithmetic number, because the mean of its divisors is an integer number (3116088).

Almost surely, 2^20752705 is an apocalyptic number.

It is an amenable number.

20752705 is a deficient number, since it is larger than the sum of its proper divisors (4175999).

20752705 is a wasteful number, since it uses less digits than its factorization.

20752705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247.

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

The square root of 20752705 is about 4555.5136922196. The cubic root of 20752705 is about 274.8051733003.

The spelling of 20752705 in words is "twenty million, seven hundred fifty-two thousand, seven hundred five".