20909468 has 12 divisors (see below), whose sum is σ = 36838200. Its totient is φ = 10384272.

The previous prime is 20909453. The next prime is 20909479. The reversal of 20909468 is 86490902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16946 + ... + 18137.

It is an arithmetic number, because the mean of its divisors is an integer number (3069850).

Almost surely, 2^20909468 is an apocalyptic number.

It is an amenable number.

20909468 is a deficient number, since it is larger than the sum of its proper divisors (15928732).

20909468 is a wasteful number, since it uses less digits than its factorization.

20909468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35236 (or 35234 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20909468 is about 4572.6871749552. The cubic root of 20909468 is about 275.4953847644.

The spelling of 20909468 in words is "twenty million, nine hundred nine thousand, four hundred sixty-eight".