22212780 has 24 divisors (see below), whose sum is σ = 62195952. Its totient is φ = 5923392.

The previous prime is 22212763. The next prime is 22212787. The reversal of 22212780 is 8721222.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22212780.

It is not an unprimeable number, because it can be changed into a prime (22212787) 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, 185047 + ... + 185166.

It is an arithmetic number, because the mean of its divisors is an integer number (2591498).

Almost surely, 2^22212780 is an apocalyptic number.

22212780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212780 is an abundant number, since it is smaller than the sum of its proper divisors (39983172).

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

22212780 is a wasteful number, since it uses less digits than its factorization.

22212780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370225 (or 370223 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 22212780 is about 4713.0436025991. The cubic root of 22212780 is about 281.1043967329.

The spelling of 22212780 in words is "twenty-two million, two hundred twelve thousand, seven hundred eighty".