20909116 has 48 divisors (see below), whose sum is σ = 41912640. Its totient is φ = 9067520.

The previous prime is 20909089. The next prime is 20909117. The reversal of 20909116 is 61190902.

It is a super-2 number, since 2×20909116² = 874382263802912, which contains 22 as substring.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909117) 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 15 ways as a sum of consecutive naturals, for example, 45126 + ... + 45586.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^20909116 is an apocalyptic number.

It is an amenable number.

20909116 is an abundant number, since it is smaller than the sum of its proper divisors (21003524).

20909116 is a wasteful number, since it uses less digits than its factorization.

20909116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20909116 is about 4572.6486853901. The cubic root of 20909116 is about 275.4938388153.

It can be divided in two parts, 20909 and 116, that added together give a square (21025 = 145²).

The spelling of 20909116 in words is "twenty million, nine hundred nine thousand, one hundred sixteen".