20909134 has 4 divisors (see below), whose sum is σ = 31363704. Its totient is φ = 10454566.

The previous prime is 20909117. The next prime is 20909173. The reversal of 20909134 is 43190902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5227282 + ... + 5227285.

It is an arithmetic number, because the mean of its divisors is an integer number (7840926).

Almost surely, 2^20909134 is an apocalyptic number.

20909134 is a deficient number, since it is larger than the sum of its proper divisors (10454570).

20909134 is a wasteful number, since it uses less digits than its factorization.

20909134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454569.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20909134 is about 4572.6506536144. The cubic root of 20909134 is about 275.4939178700.

The spelling of 20909134 in words is "twenty million, nine hundred nine thousand, one hundred thirty-four".