21353420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^2\times {\mathrm{101}}^1$

素因数の和:183

約数の個数: 72

約数和(自身を含む): 51048144

約数和(自身を除く): 29694724

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 31, 44, 55, 62, 101, 110, 124, 155, 202, 220, 310, 341, 404, 505, 620, 682, 961, 1010, 1111, 1364, 1705, 1922, 2020, 2222, 3131, 3410, 3844, 4444, 4805, 5555, 6262, 6820, 9610, 10571, 11110, 12524, 15655, 19220, 21142, 22220, 31310, 34441, 42284, 52855, 62620, 68882, 97061, 105710, 137764, 172205, 194122, 211420, 344410, 388244, 485305, 688820, 970610, 1067671, 1941220, 2135342, 4270684, 5338355, 10676710, 21353420]

約数ペア:

[(1, 21353420), (2, 10676710), (4, 5338355), (5, 4270684), (10, 2135342), (11, 1941220), (20, 1067671), (22, 970610), (31, 688820), (44, 485305), (55, 388244), (62, 344410), (101, 211420), (110, 194122), (124, 172205), (155, 137764), (202, 105710), (220, 97061), (310, 68882), (341, 62620), (404, 52855), (505, 42284), (620, 34441), (682, 31310), (961, 22220), (1010, 21142), (1111, 19220), (1364, 15655), (1705, 12524), (1922, 11110), (2020, 10571), (2222, 9610), (3131, 6820), (3410, 6262), (3844, 5555), (4444, 4805)]