20049109 has 4 divisors (see below), whose sum is σ = 20207104. Its totient is φ = 19891116.

The previous prime is 20049101. The next prime is 20049131. The reversal of 20049109 is 90194002.

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 a cyclic number.

It is not a de Polignac number, because 20049109 - 2³ = 20049101 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 (20049101) 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, 78807 + ... + 79060.

It is an arithmetic number, because the mean of its divisors is an integer number (5051776).

Almost surely, 2^20049109 is an apocalyptic number.

It is an amenable number.

20049109 is a deficient number, since it is larger than the sum of its proper divisors (157995).

20049109 is a wasteful number, since it uses less digits than its factorization.

20049109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157994.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20049109 is about 4477.6231418019. The cubic root of 20049109 is about 271.6637506221.

The spelling of 20049109 in words is "twenty million, forty-nine thousand, one hundred nine".