22131740 has 24 divisors (see below), whose sum is σ = 47355840. Its totient is φ = 8685248.

The previous prime is 22131731. The next prime is 22131749. The reversal of 22131740 is 4713122.

It is an interprime number because it is at equal distance from previous prime (22131731) and next prime (22131749).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131749) by changing a digit.

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, 9380 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (1973160).

Almost surely, 2^22131740 is an apocalyptic number.

22131740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131740 is an abundant number, since it is smaller than the sum of its proper divisors (25224100).

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

22131740 is a wasteful number, since it uses less digits than its factorization.

22131740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20941 (or 20939 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 22131740 is about 4704.4383299178. The cubic root of 22131740 is about 280.7621243925.

Adding to 22131740 its reverse (4713122), we get a palindrome (26844862).

The spelling of 22131740 in words is "twenty-two million, one hundred thirty-one thousand, seven hundred forty".