20851146 has 24 divisors (see below), whose sum is σ = 47835684. Its totient is φ = 6541440.

The previous prime is 20851109. The next prime is 20851211. The reversal of 20851146 is 64115802.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 950625 = 4461^2 + 975^2 .

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 11 ways as a sum of consecutive naturals, for example, 33765 + ... + 34376.

Almost surely, 2^20851146 is an apocalyptic number.

20851146 is an abundant number, since it is smaller than the sum of its proper divisors (26984538).

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

20851146 is a wasteful number, since it uses less digits than its factorization.

20851146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68166 (or 68163 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20851146 is about 4566.3055088332. The cubic root of 20851146 is about 275.2390032407.

Adding to 20851146 its reverse (64115802), we get a palindrome (84966948).

The spelling of 20851146 in words is "twenty million, eight hundred fifty-one thousand, one hundred forty-six".