20217386 has 16 divisors (see below), whose sum is σ = 36697536. Its totient is φ = 8154816.

The previous prime is 20217371. The next prime is 20217401. The reversal of 20217386 is 68371202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20217371) and next prime (20217401).

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 7 ways as a sum of consecutive naturals, for example, 42236 + ... + 42711.

It is an arithmetic number, because the mean of its divisors is an integer number (2293596).

Almost surely, 2^20217386 is an apocalyptic number.

20217386 is a deficient number, since it is larger than the sum of its proper divisors (16480150).

20217386 is a wasteful number, since it uses less digits than its factorization.

20217386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84973.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20217386 is about 4496.3747619610. The cubic root of 20217386 is about 272.4216804915.

Adding to 20217386 its reverse (68371202), we get a palindrome (88588588).

The spelling of 20217386 in words is "twenty million, two hundred seventeen thousand, three hundred eighty-six".