21405540

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{2111}}^1$

素因数の和:2149

約数の個数: 72

約数和(自身を含む): 64931328

約数和(自身を除く): 43525788

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 169, 195, 260, 338, 390, 507, 676, 780, 845, 1014, 1690, 2028, 2111, 2535, 3380, 4222, 5070, 6333, 8444, 10140, 10555, 12666, 21110, 25332, 27443, 31665, 42220, 54886, 63330, 82329, 109772, 126660, 137215, 164658, 274430, 329316, 356759, 411645, 548860, 713518, 823290, 1070277, 1427036, 1646580, 1783795, 2140554, 3567590, 4281108, 5351385, 7135180, 10702770, 21405540]

約数ペア:

[(1, 21405540), (2, 10702770), (3, 7135180), (4, 5351385), (5, 4281108), (6, 3567590), (10, 2140554), (12, 1783795), (13, 1646580), (15, 1427036), (20, 1070277), (26, 823290), (30, 713518), (39, 548860), (52, 411645), (60, 356759), (65, 329316), (78, 274430), (130, 164658), (156, 137215), (169, 126660), (195, 109772), (260, 82329), (338, 63330), (390, 54886), (507, 42220), (676, 31665), (780, 27443), (845, 25332), (1014, 21110), (1690, 12666), (2028, 10555), (2111, 10140), (2535, 8444), (3380, 6333), (4222, 5070)]