20022440 has 32 divisors (see below), whose sum is σ = 45674280. Its totient is φ = 7898112.

The previous prime is 20022437. The next prime is 20022451. The reversal of 20022440 is 4422002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10125124 + 9897316 = 3182^2 + 3146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509 + ... + 6348.

Almost surely, 2^20022440 is an apocalyptic number.

20022440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022440 is an abundant number, since it is smaller than the sum of its proper divisors (25651840).

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

20022440 is a wasteful number, since it uses less digits than its factorization.

20022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6941 (or 6937 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20022440 is about 4474.6441199273. The cubic root of 20022440 is about 271.5432429338.

Adding to 20022440 its reverse (4422002), we get a palindrome (24444442).

The spelling of 20022440 in words is "twenty million, twenty-two thousand, four hundred forty".