22345640 has 32 divisors (see below), whose sum is σ = 50652000. Its totient is φ = 8871744.

The previous prime is 22345621. The next prime is 22345643. The reversal of 22345640 is 4654322.

It is not an unprimeable number, because it can be changed into a prime (22345643) 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, 3551 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (1582875).

Almost surely, 2^22345640 is an apocalyptic number.

22345640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22345640 is an abundant number, since it is smaller than the sum of its proper divisors (28306360).

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

22345640 is a wasteful number, since it uses less digits than its factorization.

22345640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169 (or 4165 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 22345640 is about 4727.1175149344. The cubic root of 22345640 is about 281.6637341213.

Adding to 22345640 its reverse (4654322), we get a palindrome (26999962).

The spelling of 22345640 in words is "twenty-two million, three hundred forty-five thousand, six hundred forty".