20549109 has 16 divisors (see below), whose sum is σ = 31385088. Its totient is φ = 11715312.

The previous prime is 20549071. The next prime is 20549153. The reversal of 20549109 is 90194502.

It is a happy number.

It is not a de Polignac number, because 20549109 - 2¹³ = 20540917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11494 + ... + 13160.

It is an arithmetic number, because the mean of its divisors is an integer number (1961568).

Almost surely, 2^20549109 is an apocalyptic number.

It is an amenable number.

20549109 is a deficient number, since it is larger than the sum of its proper divisors (10835979).

20549109 is a wasteful number, since it uses less digits than its factorization.

20549109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20549109 is about 4533.1125068765. The cubic root of 20549109 is about 273.9035526426.

The spelling of 20549109 in words is "twenty million, five hundred forty-nine thousand, one hundred nine".