20765541 has 4 divisors (see below), whose sum is σ = 27687392. Its totient is φ = 13843692.

The previous prime is 20765539. The next prime is 20765561. The reversal of 20765541 is 14556702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20765541 - 2¹ = 20765539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20765499 and 20765508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20765531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3460921 + ... + 3460926.

It is an arithmetic number, because the mean of its divisors is an integer number (6921848).

Almost surely, 2^20765541 is an apocalyptic number.

It is an amenable number.

20765541 is a deficient number, since it is larger than the sum of its proper divisors (6921851).

20765541 is an equidigital number, since it uses as much as digits as its factorization.

20765541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6921850.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20765541 is about 4556.9223166519. The cubic root of 20765541 is about 274.8618192845.

The spelling of 20765541 in words is "twenty million, seven hundred sixty-five thousand, five hundred forty-one".