20898656 has 12 divisors (see below), whose sum is σ = 41144292. Its totient is φ = 10449312.

The previous prime is 20898649. The next prime is 20898667. The reversal of 20898656 is 65689802.

It is a happy number.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 326510 + ... + 326573.

It is an arithmetic number, because the mean of its divisors is an integer number (3428691).

Almost surely, 2^20898656 is an apocalyptic number.

It is an amenable number.

20898656 is a deficient number, since it is larger than the sum of its proper divisors (20245636).

20898656 is an equidigital number, since it uses as much as digits as its factorization.

20898656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653093 (or 653085 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 20898656 is about 4571.5047850790. The cubic root of 20898656 is about 275.4478916119.

The spelling of 20898656 in words is "twenty million, eight hundred ninety-eight thousand, six hundred fifty-six".