20216394 has 24 divisors (see below), whose sum is σ = 47784672. Its totient is φ = 6126120.

The previous prime is 20216387. The next prime is 20216411. The reversal of 20216394 is 49361202.

20216394 is a `hidden beast` number, since 2 + 0 + 21 + 639 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50854 + ... + 51249.

It is an arithmetic number, because the mean of its divisors is an integer number (1991028).

Almost surely, 2^20216394 is an apocalyptic number.

20216394 is an abundant number, since it is smaller than the sum of its proper divisors (27568278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20216394 is a wasteful number, since it uses less digits than its factorization.

20216394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102122 (or 102119 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20216394 is about 4496.2644495181. The cubic root of 20216394 is about 272.4172248095.

Adding to 20216394 its reverse (49361202), we get a palindrome (69577596).

The spelling of 20216394 in words is "twenty million, two hundred sixteen thousand, three hundred ninety-four".