20222740 has 12 divisors (see below), whose sum is σ = 42467796. Its totient is φ = 8089088.

The previous prime is 20222731. The next prime is 20222747. The reversal of 20222740 is 4722202.

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 9647236 = 3252^2 + 3106^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505549 + ... + 505588.

It is an arithmetic number, because the mean of its divisors is an integer number (3538983).

Almost surely, 2^20222740 is an apocalyptic number.

20222740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20222740 is an abundant number, since it is smaller than the sum of its proper divisors (22245056).

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

20222740 is a wasteful number, since it uses less digits than its factorization.

20222740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011146 (or 1011144 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 20222740 is about 4496.9700910724. The cubic root of 20222740 is about 272.4457260818.

Adding to 20222740 its reverse (4722202), we get a palindrome (24944942).

The spelling of 20222740 in words is "twenty million, two hundred twenty-two thousand, seven hundred forty".