20331765 has 24 divisors (see below), whose sum is σ = 35413560. Its totient is φ = 10790784.

The previous prime is 20331761. The next prime is 20331781. The reversal of 20331765 is 56713302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3538161 + 16793604 = 1881^2 + 4098^2 .

It is not a de Polignac number, because 20331765 - 2² = 20331761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9319 + ... + 11291.

It is an arithmetic number, because the mean of its divisors is an integer number (1475565).

Almost surely, 2^20331765 is an apocalyptic number.

It is an amenable number.

20331765 is a deficient number, since it is larger than the sum of its proper divisors (15081795).

20331765 is a wasteful number, since it uses less digits than its factorization.

20331765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213 (or 2210 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 20331765 is about 4509.0758476655. The cubic root of 20331765 is about 272.9344527253.

The spelling of 20331765 in words is "twenty million, three hundred thirty-one thousand, seven hundred sixty-five".