20386842 has 48 divisors (see below), whose sum is σ = 50232960. Its totient is φ = 5480832.

The previous prime is 20386837. The next prime is 20386843. The reversal of 20386842 is 24868302.

It is not an unprimeable number, because it can be changed into a prime (20386843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2959 + ... + 7037.

It is an arithmetic number, because the mean of its divisors is an integer number (1046520).

Almost surely, 2^20386842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20386842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25116480).

20386842 is an abundant number, since it is smaller than the sum of its proper divisors (29846118).

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

20386842 is a wasteful number, since it uses less digits than its factorization.

20386842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115 (or 4108 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 20386842 is about 4515.1790662165. The cubic root of 20386842 is about 273.1806824945.

The spelling of 20386842 in words is "twenty million, three hundred eighty-six thousand, eight hundred forty-two".