27700220 has 48 divisors (see below), whose sum is σ = 60752160. Its totient is φ = 10596096.

The previous prime is 27700219. The next prime is 27700223. The reversal of 27700220 is 2200772.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 27700192 and 27700201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27700223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94394 + ... + 94686.

It is an arithmetic number, because the mean of its divisors is an integer number (1265670).

Almost surely, 2^27700220 is an apocalyptic number.

27700220 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 27700220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30376080).

27700220 is an abundant number, since it is smaller than the sum of its proper divisors (33051940).

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

27700220 is a wasteful number, since it uses less digits than its factorization.

27700220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 20.

The square root of 27700220 is about 5263.0998470483. The cubic root of 27700220 is about 302.5713057321.

Adding to 27700220 its reverse (2200772), we get a palindrome (29900992).

The spelling of 27700220 in words is "twenty-seven million, seven hundred thousand, two hundred twenty".