20672765 has 8 divisors (see below), whose sum is σ = 26266680. Its totient is φ = 15565312.

The previous prime is 20672747. The next prime is 20672767. The reversal of 20672765 is 56727602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2328676 + 18344089 = 1526^2 + 4283^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20672765 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121520 + ... + 121689.

It is an arithmetic number, because the mean of its divisors is an integer number (3283335).

Almost surely, 2^20672765 is an apocalyptic number.

It is an amenable number.

20672765 is a deficient number, since it is larger than the sum of its proper divisors (5593915).

20672765 is a wasteful number, since it uses less digits than its factorization.

20672765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243231.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 20672765 is about 4546.7312434319. The cubic root of 20672765 is about 274.4518668583.

The spelling of 20672765 in words is "twenty million, six hundred seventy-two thousand, seven hundred sixty-five".