21561990

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{191}}^1$

素因数の和:325

約数の個数: 64

約数和(自身を含む): 53747712

約数和(自身を除く): 32185722

約数列:

[1, 2, 3, 5, 6, 10, 15, 30, 53, 71, 106, 142, 159, 191, 213, 265, 318, 355, 382, 426, 530, 573, 710, 795, 955, 1065, 1146, 1590, 1910, 2130, 2865, 3763, 5730, 7526, 10123, 11289, 13561, 18815, 20246, 22578, 27122, 30369, 37630, 40683, 50615, 56445, 60738, 67805, 81366, 101230, 112890, 135610, 151845, 203415, 303690, 406830, 718733, 1437466, 2156199, 3593665, 4312398, 7187330, 10780995, 21561990]

約数ペア:

[(1, 21561990), (2, 10780995), (3, 7187330), (5, 4312398), (6, 3593665), (10, 2156199), (15, 1437466), (30, 718733), (53, 406830), (71, 303690), (106, 203415), (142, 151845), (159, 135610), (191, 112890), (213, 101230), (265, 81366), (318, 67805), (355, 60738), (382, 56445), (426, 50615), (530, 40683), (573, 37630), (710, 30369), (795, 27122), (955, 22578), (1065, 20246), (1146, 18815), (1590, 13561), (1910, 11289), (2130, 10123), (2865, 7526), (3763, 5730)]