20909754 has 48 divisors (see below), whose sum is σ = 48058920. Its totient is φ = 6558720.

The previous prime is 20909753. The next prime is 20909767. The reversal of 20909754 is 45790902.

It can be written as a sum of positive squares in 4 ways, for example, as 17766225 + 3143529 = 4215^2 + 1773^2 .

It is not an unprimeable number, because it can be changed into a prime (20909753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20914 + ... + 21890.

Almost surely, 2^20909754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20909754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24029460).

20909754 is an abundant number, since it is smaller than the sum of its proper divisors (27149166).

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

20909754 is a wasteful number, since it uses less digits than its factorization.

20909754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20909754 is about 4572.7184474883. The cubic root of 20909754 is about 275.4966408353.

The spelling of 20909754 in words is "twenty million, nine hundred nine thousand, seven hundred fifty-four".