20752905 has 32 divisors (see below), whose sum is σ = 34191360. Its totient is φ = 10745280.

The previous prime is 20752891. The next prime is 20752933. The reversal of 20752905 is 50925702.

It is a happy number.

It is not a de Polignac number, because 20752905 - 2⁵ = 20752873 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 98250 + ... + 98460.

It is an arithmetic number, because the mean of its divisors is an integer number (1068480).

Almost surely, 2^20752905 is an apocalyptic number.

It is an amenable number.

20752905 is a deficient number, since it is larger than the sum of its proper divisors (13438455).

20752905 is a wasteful number, since it uses less digits than its factorization.

20752905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 20752905 is about 4555.5356435879. The cubic root of 20752905 is about 274.8060560906.

The spelling of 20752905 in words is "twenty million, seven hundred fifty-two thousand, nine hundred five".