22393640 has 16 divisors (see below), whose sum is σ = 50385780. Its totient is φ = 8957440.

The previous prime is 22393601. The next prime is 22393643. The reversal of 22393640 is 4639322.

It can be written as a sum of positive squares in 2 ways, for example, as 22335076 + 58564 = 4726^2 + 242^2 .

It is a super-2 number, since 2×22393640² = 1002950224899200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22393643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279881 + ... + 279960.

Almost surely, 2^22393640 is an apocalyptic number.

22393640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22393640 is an abundant number, since it is smaller than the sum of its proper divisors (27992140).

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

22393640 is a wasteful number, since it uses less digits than its factorization.

22393640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559852 (or 559848 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 22393640 is about 4732.1918811477. The cubic root of 22393640 is about 281.8652676977.

The spelling of 22393640 in words is "twenty-two million, three hundred ninety-three thousand, six hundred forty".