22420540 has 12 divisors (see below), whose sum is σ = 47083176. Its totient is φ = 8968208.

The previous prime is 22420529. The next prime is 22420547. The reversal of 22420540 is 4502422.

It is a super-2 number, since 2×22420540² = 1005361227783200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22420547) 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, 560494 + ... + 560533.

It is an arithmetic number, because the mean of its divisors is an integer number (3923598).

Almost surely, 2^22420540 is an apocalyptic number.

22420540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22420540 is an abundant number, since it is smaller than the sum of its proper divisors (24662636).

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

22420540 is a wasteful number, since it uses less digits than its factorization.

22420540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121036 (or 1121034 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 22420540 is about 4735.0332628188. The cubic root of 22420540 is about 281.9780845769.

Adding to 22420540 its reverse (4502422), we get a palindrome (26922962).

The spelling of 22420540 in words is "twenty-two million, four hundred twenty thousand, five hundred forty".