20777224 has 48 divisors (see below), whose sum is σ = 43929900. Its totient is φ = 9147264.

The previous prime is 20777209. The next prime is 20777231. The reversal of 20777224 is 42277702.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 688900 = 4482^2 + 830^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250287 + ... + 250369.

Almost surely, 2^20777224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20777224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21964950).

20777224 is an abundant number, since it is smaller than the sum of its proper divisors (23152676).

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

20777224 is a wasteful number, since it uses less digits than its factorization.

20777224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20777224 is about 4558.2040322917. The cubic root of 20777224 is about 274.9133567265.

The spelling of 20777224 in words is "twenty million, seven hundred seventy-seven thousand, two hundred twenty-four".