20909416 has 16 divisors (see below), whose sum is σ = 42769440. Its totient is φ = 9504240.

The previous prime is 20909389. The next prime is 20909419. The reversal of 20909416 is 61490902.

It is a happy number.

It is a super-2 number, since 2×20909416² = 874407354922112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20909419) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118716 + ... + 118891.

It is an arithmetic number, because the mean of its divisors is an integer number (2673090).

Almost surely, 2^20909416 is an apocalyptic number.

It is an amenable number.

20909416 is an abundant number, since it is smaller than the sum of its proper divisors (21860024).

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

20909416 is a wasteful number, since it uses less digits than its factorization.

20909416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237624 (or 237620 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20909416 is about 4572.6814890171. The cubic root of 20909416 is about 275.4951563867.

The spelling of 20909416 in words is "twenty million, nine hundred nine thousand, four hundred sixteen".