20905346 has 64 divisors (see below), whose sum is σ = 42024960. Its totient is φ = 7560000.

The previous prime is 20905337. The next prime is 20905349. The reversal of 20905346 is 64350902.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (20905349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138371 + ... + 138521.

It is an arithmetic number, because the mean of its divisors is an integer number (656640).

Almost surely, 2^20905346 is an apocalyptic number.

20905346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20905346 is a wasteful number, since it uses less digits than its factorization.

20905346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20905346 is about 4572.2364330817. The cubic root of 20905346 is about 275.4772802610.

The spelling of 20905346 in words is "twenty million, nine hundred five thousand, three hundred forty-six".