20217146 has 8 divisors (see below), whose sum is σ = 31304064. Its totient is φ = 9782460.

The previous prime is 20217137. The next prime is 20217163. The reversal of 20217146 is 64171202.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162980 + ... + 163103.

It is an arithmetic number, because the mean of its divisors is an integer number (3913008).

Almost surely, 2^20217146 is an apocalyptic number.

20217146 is a deficient number, since it is larger than the sum of its proper divisors (11086918).

20217146 is a wasteful number, since it uses less digits than its factorization.

20217146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326116.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20217146 is about 4496.3480737149. The cubic root of 20217146 is about 272.4206025172.

Adding to 20217146 its reverse (64171202), we get a palindrome (84388348).

The spelling of 20217146 in words is "twenty million, two hundred seventeen thousand, one hundred forty-six".