20752745 has 16 divisors (see below), whose sum is σ = 27546960. Its totient is φ = 14909184.

The previous prime is 20752741. The next prime is 20752763. The reversal of 20752745 is 54725702.

It can be written as a sum of positive squares in 8 ways, for example, as 222784 + 20529961 = 472^2 + 4531^2 .

It is a cyclic number.

It is not a de Polignac number, because 20752745 - 2² = 20752741 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20752741) 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 15 ways as a sum of consecutive naturals, for example, 1910 + ... + 6719.

It is an arithmetic number, because the mean of its divisors is an integer number (1721685).

Almost surely, 2^20752745 is an apocalyptic number.

It is an amenable number.

20752745 is a deficient number, since it is larger than the sum of its proper divisors (6794215).

20752745 is a wasteful number, since it uses less digits than its factorization.

20752745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 20752745 is about 4555.5180825017. The cubic root of 20752745 is about 274.8053498588.

The spelling of 20752745 in words is "twenty million, seven hundred fifty-two thousand, seven hundred forty-five".