22081780 has 48 divisors (see below), whose sum is σ = 54302976. Its totient is φ = 7384320.

The previous prime is 22081777. The next prime is 22081811. The reversal of 22081780 is 8718022.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3817 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (1131312).

Almost surely, 2^22081780 is an apocalyptic number.

22081780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22081780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27151488).

22081780 is an abundant number, since it is smaller than the sum of its proper divisors (32221196).

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

22081780 is a wasteful number, since it uses less digits than its factorization.

22081780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 22081780 is about 4699.1254505493. The cubic root of 22081780 is about 280.5507018879.

The spelling of 22081780 in words is "twenty-two million, eighty-one thousand, seven hundred eighty".