22420140 has 24 divisors (see below), whose sum is σ = 62776560. Its totient is φ = 5978688.

The previous prime is 22420129. The next prime is 22420141. The reversal of 22420140 is 4102422.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (22420141) 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, 186775 + ... + 186894.

It is an arithmetic number, because the mean of its divisors is an integer number (2615690).

Almost surely, 2^22420140 is an apocalyptic number.

22420140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22420140 is an abundant number, since it is smaller than the sum of its proper divisors (40356420).

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

22420140 is a wasteful number, since it uses less digits than its factorization.

22420140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373681 (or 373679 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22420140 is about 4734.9910242787. The cubic root of 22420140 is about 281.9764076636.

Adding to 22420140 its reverse (4102422), we get a palindrome (26522562).

The spelling of 22420140 in words is "twenty-two million, four hundred twenty thousand, one hundred forty".