22071940 has 48 divisors (see below), whose sum is σ = 51819264. Its totient is φ = 7827200.

The previous prime is 22071937. The next prime is 22071979. The reversal of 22071940 is 4917022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7797 + ... + 10243.

It is an arithmetic number, because the mean of its divisors is an integer number (1079568).

Almost surely, 2^22071940 is an apocalyptic number.

22071940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22071940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25909632).

22071940 is an abundant number, since it is smaller than the sum of its proper divisors (29747324).

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

22071940 is a wasteful number, since it uses less digits than its factorization.

22071940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508 (or 2506 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 22071940 is about 4698.0783305518. The cubic root of 22071940 is about 280.5090230458.

Adding to 22071940 its reverse (4917022), we get a palindrome (26988962).

The spelling of 22071940 in words is "twenty-two million, seventy-one thousand, nine hundred forty".