22207780 has 144 divisors (see below), whose sum is σ = 60673536. Its totient is φ = 6773760.

The previous prime is 22207739. The next prime is 22207793. The reversal of 22207780 is 8770222.

22207780 is a nontrivial binomial coefficient, being equal to C(6665, 2).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 516439 + ... + 516481.

It is an arithmetic number, because the mean of its divisors is an integer number (421344).

Almost surely, 2^22207780 is an apocalyptic number.

22207780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

22207780 is the 6664-th triangular number.

22207780 is the 2222-nd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22207780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30336768).

22207780 is an abundant number, since it is smaller than the sum of its proper divisors (38465756).

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

22207780 is a wasteful number, since it uses less digits than its factorization.

22207780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 22207780 is about 4712.5131299552. The cubic root of 22207780 is about 281.0833033585.

It can be divided in two parts, 2220 and 7780, that added together give a 4-th power (10000 = 10⁴).

The spelling of 22207780 in words is "twenty-two million, two hundred seven thousand, seven hundred eighty".