20420346 has 8 divisors (see below), whose sum is σ = 40840704. Its totient is φ = 6806780.

The previous prime is 20420329. The next prime is 20420347. The reversal of 20420346 is 64302402.

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

20420346 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20420347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701690 + ... + 1701701.

It is an arithmetic number, because the mean of its divisors is an integer number (5105088).

Almost surely, 2^20420346 is an apocalyptic number.

20420346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20420346 is a wasteful number, since it uses less digits than its factorization.

20420346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403396.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20420346 is about 4518.8876949975. The cubic root of 20420346 is about 273.3302501470.

Adding to 20420346 its reverse (64302402), we get a palindrome (84722748).

The spelling of 20420346 in words is "twenty million, four hundred twenty thousand, three hundred forty-six".