217808420

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{640613}}^1$

素因数の和:640639

約数の個数: 24

約数和(自身を含む): 484304184

約数和(自身を除く): 266495764

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 640613, 1281226, 2562452, 3203065, 6406130, 10890421, 12812260, 21780842, 43561684, 54452105, 108904210, 217808420]

約数ペア:

[(1, 217808420), (2, 108904210), (4, 54452105), (5, 43561684), (10, 21780842), (17, 12812260), (20, 10890421), (34, 6406130), (68, 3203065), (85, 2562452), (170, 1281226), (340, 640613)]