20709270 has 80 divisors (see below), whose sum is σ = 57272688. Its totient is φ = 5365440.

The previous prime is 20709253. The next prime is 20709289. The reversal of 20709270 is 7290702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29625 + ... + 30315.

Almost surely, 2^20709270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20709270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28636344).

20709270 is an abundant number, since it is smaller than the sum of its proper divisors (36563418).

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

20709270 is a wasteful number, since it uses less digits than its factorization.

20709270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20709270 is about 4550.7438952330. The cubic root of 20709270 is about 274.6133187961.

Adding to 20709270 its reverse (7290702), we get a palindrome (27999972).

The spelling of 20709270 in words is "twenty million, seven hundred nine thousand, two hundred seventy".