20921580

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{2473}}^1$

素因数の和:2535

約数の個数: 72

約数和(自身を含む): 64838592

約数和(自身を除く): 43917012

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 47, 60, 90, 94, 141, 180, 188, 235, 282, 423, 470, 564, 705, 846, 940, 1410, 1692, 2115, 2473, 2820, 4230, 4946, 7419, 8460, 9892, 12365, 14838, 22257, 24730, 29676, 37095, 44514, 49460, 74190, 89028, 111285, 116231, 148380, 222570, 232462, 348693, 445140, 464924, 581155, 697386, 1046079, 1162310, 1394772, 1743465, 2092158, 2324620, 3486930, 4184316, 5230395, 6973860, 10460790, 20921580]

約数ペア:

[(1, 20921580), (2, 10460790), (3, 6973860), (4, 5230395), (5, 4184316), (6, 3486930), (9, 2324620), (10, 2092158), (12, 1743465), (15, 1394772), (18, 1162310), (20, 1046079), (30, 697386), (36, 581155), (45, 464924), (47, 445140), (60, 348693), (90, 232462), (94, 222570), (141, 148380), (180, 116231), (188, 111285), (235, 89028), (282, 74190), (423, 49460), (470, 44514), (564, 37095), (705, 29676), (846, 24730), (940, 22257), (1410, 14838), (1692, 12365), (2115, 9892), (2473, 8460), (2820, 7419), (4230, 4946)]