20955549 has 4 divisors (see below), whose sum is σ = 27940736. Its totient is φ = 13970364.

The previous prime is 20955503. The next prime is 20955559. The reversal of 20955549 is 94555902.

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 20955549 - 2⁷ = 20955421 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 (20955559) 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, 3492589 + ... + 3492594.

It is an arithmetic number, because the mean of its divisors is an integer number (6985184).

Almost surely, 2^20955549 is an apocalyptic number.

It is an amenable number.

20955549 is a deficient number, since it is larger than the sum of its proper divisors (6985187).

20955549 is an equidigital number, since it uses as much as digits as its factorization.

20955549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6985186.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 20955549 is about 4577.7231239995. The cubic root of 20955549 is about 275.6976183213.

The spelling of 20955549 in words is "twenty million, nine hundred fifty-five thousand, five hundred forty-nine".