20224665 has 12 divisors (see below), whose sum is σ = 35056164. Its totient is φ = 10786464.

The previous prime is 20224661. The next prime is 20224667. The reversal of 20224665 is 56642202.

It can be written as a sum of positive squares in 2 ways, for example, as 4447881 + 15776784 = 2109^2 + 3972^2 .

It is not a de Polignac number, because 20224665 - 2² = 20224661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20224661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224674 + ... + 224763.

It is an arithmetic number, because the mean of its divisors is an integer number (2921347).

Almost surely, 2^20224665 is an apocalyptic number.

It is an amenable number.

20224665 is a deficient number, since it is larger than the sum of its proper divisors (14831499).

20224665 is a wasteful number, since it uses less digits than its factorization.

20224665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449448 (or 449445 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20224665 is about 4497.1841189793. The cubic root of 20224665 is about 272.4543704986.

Adding to 20224665 its reverse (56642202), we get a palindrome (76866867).

The spelling of 20224665 in words is "twenty million, two hundred twenty-four thousand, six hundred sixty-five".