20702220 has 96 divisors (see below), whose sum is σ = 72285696. Its totient is φ = 4300800.

The previous prime is 20702219. The next prime is 20702233. The reversal of 20702220 is 2220702.

20702220 = T₈₄₀ + T₈₄₁ + ... + T₈₉₄.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20702220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2380 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (752976).

Almost surely, 2^20702220 is an apocalyptic number.

20702220 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 20702220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36142848).

20702220 is an abundant number, since it is smaller than the sum of its proper divisors (51583476).

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

20702220 is a wasteful number, since it uses less digits than its factorization.

20702220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4509 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20702220 is about 4549.9692306652. The cubic root of 20702220 is about 274.5821533063.

Adding to 20702220 its reverse (2220702), we get a palindrome (22922922).

The spelling of 20702220 in words is "twenty million, seven hundred two thousand, two hundred twenty".