22042840 has 32 divisors (see below), whose sum is σ = 49770000. Its totient is φ = 8786304.

The previous prime is 22042807. The next prime is 22042841. The reversal of 22042840 is 4824022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22042841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13171 + ... + 14749.

Almost surely, 2^22042840 is an apocalyptic number.

22042840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22042840 is an abundant number, since it is smaller than the sum of its proper divisors (27727160).

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

22042840 is a wasteful number, since it uses less digits than its factorization.

22042840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939 (or 1935 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 22042840 is about 4694.9802981482. The cubic root of 22042840 is about 280.3856929635.

Adding to 22042840 its reverse (4824022), we get a palindrome (26866862).

The spelling of 22042840 in words is "twenty-two million, forty-two thousand, eight hundred forty".