21780400

素因数分解:

$2^4\times 5^2\times {\mathrm{17}}^1\times {\mathrm{3203}}^1$

素因数の和:3238

約数の個数: 60

約数和(自身を含む): 55422792

約数和(自身を除く): 33642392

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 25, 34, 40, 50, 68, 80, 85, 100, 136, 170, 200, 272, 340, 400, 425, 680, 850, 1360, 1700, 3203, 3400, 6406, 6800, 12812, 16015, 25624, 32030, 51248, 54451, 64060, 80075, 108902, 128120, 160150, 217804, 256240, 272255, 320300, 435608, 544510, 640600, 871216, 1089020, 1281200, 1361275, 2178040, 2722550, 4356080, 5445100, 10890200, 21780400]

約数ペア:

[(1, 21780400), (2, 10890200), (4, 5445100), (5, 4356080), (8, 2722550), (10, 2178040), (16, 1361275), (17, 1281200), (20, 1089020), (25, 871216), (34, 640600), (40, 544510), (50, 435608), (68, 320300), (80, 272255), (85, 256240), (100, 217804), (136, 160150), (170, 128120), (200, 108902), (272, 80075), (340, 64060), (400, 54451), (425, 51248), (680, 32030), (850, 25624), (1360, 16015), (1700, 12812), (3203, 6800), (3400, 6406)]