21235760

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2917}}^1$

素因数の和:2950

約数の個数: 80

約数和(自身を含む): 60787776

約数和(自身を除く): 39552016

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2917, 3640, 5834, 7280, 11668, 14585, 20419, 23336, 29170, 37921, 40838, 46672, 58340, 75842, 81676, 102095, 116680, 151684, 163352, 189605, 204190, 233360, 265447, 303368, 326704, 379210, 408380, 530894, 606736, 758420, 816760, 1061788, 1327235, 1516840, 1633520, 2123576, 2654470, 3033680, 4247152, 5308940, 10617880, 21235760]

約数ペア:

[(1, 21235760), (2, 10617880), (4, 5308940), (5, 4247152), (7, 3033680), (8, 2654470), (10, 2123576), (13, 1633520), (14, 1516840), (16, 1327235), (20, 1061788), (26, 816760), (28, 758420), (35, 606736), (40, 530894), (52, 408380), (56, 379210), (65, 326704), (70, 303368), (80, 265447), (91, 233360), (104, 204190), (112, 189605), (130, 163352), (140, 151684), (182, 116680), (208, 102095), (260, 81676), (280, 75842), (364, 58340), (455, 46672), (520, 40838), (560, 37921), (728, 29170), (910, 23336), (1040, 20419), (1456, 14585), (1820, 11668), (2917, 7280), (3640, 5834)]