20420386 has 8 divisors (see below), whose sum is σ = 35006400. Its totient is φ = 8751588.

The previous prime is 20420377. The next prime is 20420443. The reversal of 20420386 is 68302402.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20420386.

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, 729286 + ... + 729313.

It is an arithmetic number, because the mean of its divisors is an integer number (4375800).

Almost surely, 2^20420386 is an apocalyptic number.

20420386 is a deficient number, since it is larger than the sum of its proper divisors (14586014).

20420386 is a wasteful number, since it uses less digits than its factorization.

20420386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458608.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20420386 is about 4518.8921208633. The cubic root of 20420386 is about 273.3304286161.

Adding to 20420386 its reverse (68302402), we get a palindrome (88722788).

The spelling of 20420386 in words is "twenty million, four hundred twenty thousand, three hundred eighty-six".