20429186 has 8 divisors (see below), whose sum is σ = 31632384. Its totient is φ = 9885060.

The previous prime is 20429179. The next prime is 20429191. The reversal of 20429186 is 68192402.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 164690 + ... + 164813.

It is an arithmetic number, because the mean of its divisors is an integer number (3954048).

Almost surely, 2^20429186 is an apocalyptic number.

20429186 is a deficient number, since it is larger than the sum of its proper divisors (11203198).

20429186 is a wasteful number, since it uses less digits than its factorization.

20429186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329536.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20429186 is about 4519.8657059696. The cubic root of 20429186 is about 273.3696861557.

The spelling of 20429186 in words is "twenty million, four hundred twenty-nine thousand, one hundred eighty-six".