20808146 has 16 divisors (see below), whose sum is σ = 32673024. Its totient is φ = 9920064.

The previous prime is 20808107. The next prime is 20808233. The reversal of 20808146 is 64180802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20810 + ... + 21786.

It is an arithmetic number, because the mean of its divisors is an integer number (2042064).

Almost surely, 2^20808146 is an apocalyptic number.

20808146 is a deficient number, since it is larger than the sum of its proper divisors (11864878).

20808146 is a wasteful number, since it uses less digits than its factorization.

20808146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20808146 is about 4561.5946773031. The cubic root of 20808146 is about 275.0496703669.

Adding to 20808146 its reverse (64180802), we get a palindrome (84988948).

The spelling of 20808146 in words is "twenty million, eight hundred eight thousand, one hundred forty-six".