22102740 has 144 divisors (see below), whose sum is σ = 76265280. Its totient is φ = 5270400.

The previous prime is 22102733. The next prime is 22102781. The reversal of 22102740 is 4720122.

It is a super-2 number, since 2×22102740² = 977062231015200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 362310 + ... + 362370.

It is an arithmetic number, because the mean of its divisors is an integer number (529620).

Almost surely, 2^22102740 is an apocalyptic number.

22102740 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 22102740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38132640).

22102740 is an abundant number, since it is smaller than the sum of its proper divisors (54162540).

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

22102740 is a wasteful number, since it uses less digits than its factorization.

22102740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22102740 is about 4701.3551237914. The cubic root of 22102740 is about 280.6394399509.

Adding to 22102740 its reverse (4720122), we get a palindrome (26822862).

It can be divided in two parts, 2210 and 2740, that added together give a triangular number (4950 = T₉₉).

The spelling of 22102740 in words is "twenty-two million, one hundred two thousand, seven hundred forty".