20309763 has 16 divisors (see below), whose sum is σ = 27772416. Its totient is φ = 13198080.

The previous prime is 20309753. The next prime is 20309771. The reversal of 20309763 is 36790302.

It is a happy number.

It is not a de Polignac number, because 20309763 - 2⁶ = 20309699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20309763.

It is not an unprimeable number, because it can be changed into a prime (20309753) 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, 20170 + ... + 21152.

It is an arithmetic number, because the mean of its divisors is an integer number (1735776).

Almost surely, 2^20309763 is an apocalyptic number.

20309763 is a deficient number, since it is larger than the sum of its proper divisors (7462653).

20309763 is an equidigital number, since it uses as much as digits as its factorization.

20309763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154.

The product of its (nonzero) digits is 6804, while the sum is 30.

The square root of 20309763 is about 4506.6354412133. The cubic root of 20309763 is about 272.8359652720.

The spelling of 20309763 in words is "twenty million, three hundred nine thousand, seven hundred sixty-three".