22280420 has 24 divisors (see below), whose sum is σ = 46894848. Its totient is φ = 8892000.

The previous prime is 22280411. The next prime is 22280431. The reversal of 22280420 is 2408222.

22280420 = 370² + 371² + ... + 489².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22280392 and 22280401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10445 + ... + 12395.

It is an arithmetic number, because the mean of its divisors is an integer number (1953952).

Almost surely, 2^22280420 is an apocalyptic number.

22280420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22280420 is an abundant number, since it is smaller than the sum of its proper divisors (24614428).

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

22280420 is a wasteful number, since it uses less digits than its factorization.

22280420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2529 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 22280420 is about 4720.2139782006. The cubic root of 22280420 is about 281.3894373608.

Adding to 22280420 its reverse (2408222), we get a palindrome (24688642).

The spelling of 22280420 in words is "twenty-two million, two hundred eighty thousand, four hundred twenty".