20384780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{163}}^1$

素因数の和:235

約数の個数: 72

約数和(自身を含む): 47899152

約数和(自身を除く): 27514372

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 37, 52, 65, 74, 130, 148, 163, 169, 185, 260, 326, 338, 370, 481, 652, 676, 740, 815, 845, 962, 1630, 1690, 1924, 2119, 2405, 3260, 3380, 4238, 4810, 6031, 6253, 8476, 9620, 10595, 12062, 12506, 21190, 24124, 25012, 27547, 30155, 31265, 42380, 55094, 60310, 62530, 78403, 110188, 120620, 125060, 137735, 156806, 275470, 313612, 392015, 550940, 784030, 1019239, 1568060, 2038478, 4076956, 5096195, 10192390, 20384780]

約数ペア:

[(1, 20384780), (2, 10192390), (4, 5096195), (5, 4076956), (10, 2038478), (13, 1568060), (20, 1019239), (26, 784030), (37, 550940), (52, 392015), (65, 313612), (74, 275470), (130, 156806), (148, 137735), (163, 125060), (169, 120620), (185, 110188), (260, 78403), (326, 62530), (338, 60310), (370, 55094), (481, 42380), (652, 31265), (676, 30155), (740, 27547), (815, 25012), (845, 24124), (962, 21190), (1630, 12506), (1690, 12062), (1924, 10595), (2119, 9620), (2405, 8476), (3260, 6253), (3380, 6031), (4238, 4810)]