22031730 has 64 divisors (see below), whose sum is σ = 67150080. Its totient is φ = 5035392.

The previous prime is 22031699. The next prime is 22031741. The reversal of 22031730 is 3713022.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 31 ways as a sum of consecutive naturals, for example, 3939 + ... + 7718.

It is an arithmetic number, because the mean of its divisors is an integer number (1049220).

Almost surely, 2^22031730 is an apocalyptic number.

22031730 is an abundant number, since it is smaller than the sum of its proper divisors (45118350).

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

22031730 is a wasteful number, since it uses less digits than its factorization.

22031730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11680 (or 11674 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 22031730 is about 4693.7969704707. The cubic root of 22031730 is about 280.3385785180.

Adding to 22031730 its reverse (3713022), we get a palindrome (25744752).

The spelling of 22031730 in words is "twenty-two million, thirty-one thousand, seven hundred thirty".