22013780 has 36 divisors (see below), whose sum is σ = 48806100. Its totient is φ = 8339328.

The previous prime is 22013777. The next prime is 22013791. The reversal of 22013780 is 8731022.

It can be written as a sum of positive squares in 2 ways, for example, as 4857616 + 17156164 = 2204^2 + 4142^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5696 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (1355725).

Almost surely, 2^22013780 is an apocalyptic number.

22013780 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 22013780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24403050).

22013780 is an abundant number, since it is smaller than the sum of its proper divisors (26792320).

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

22013780 is a wasteful number, since it uses less digits than its factorization.

22013780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096 (or 3075 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 22013780 is about 4691.8844828065. The cubic root of 22013780 is about 280.2624240398.

The spelling of 22013780 in words is "twenty-two million, thirteen thousand, seven hundred eighty".