20022740 has 24 divisors (see below), whose sum is σ = 42485352. Its totient is φ = 7925760.

The previous prime is 20022733. The next prime is 20022791. The reversal of 20022740 is 4722002.

It can be written as a sum of positive squares in 4 ways, for example, as 2062096 + 17960644 = 1436^2 + 4238^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3221 + ... + 7100.

It is an arithmetic number, because the mean of its divisors is an integer number (1770223).

Almost surely, 2^20022740 is an apocalyptic number.

20022740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022740 is an abundant number, since it is smaller than the sum of its proper divisors (22462612).

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

20022740 is a wasteful number, since it uses less digits than its factorization.

20022740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427 (or 10425 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20022740 is about 4474.6776420207. The cubic root of 20022740 is about 271.5445991216.

Adding to 20022740 its reverse (4722002), we get a palindrome (24744742).

The spelling of 20022740 in words is "twenty million, twenty-two thousand, seven hundred forty".