20655541 has 4 divisors (see below), whose sum is σ = 21553632. Its totient is φ = 19757452.

The previous prime is 20655529. The next prime is 20655553. The reversal of 20655541 is 14555602.

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 an interprime number because it is at equal distance from previous prime (20655529) and next prime (20655553).

It is a cyclic number.

It is not a de Polignac number, because 20655541 - 2¹³ = 20647349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655241) 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, 449011 + ... + 449056.

It is an arithmetic number, because the mean of its divisors is an integer number (5388408).

Almost surely, 2^20655541 is an apocalyptic number.

It is an amenable number.

20655541 is a deficient number, since it is larger than the sum of its proper divisors (898091).

20655541 is an equidigital number, since it uses as much as digits as its factorization.

20655541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898090.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 20655541 is about 4544.8367407422. The cubic root of 20655541 is about 274.3756236722.

The spelling of 20655541 in words is "twenty million, six hundred fifty-five thousand, five hundred forty-one".