21497740

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{139}}^1$

素因数の和:215

約数の個数: 96

約数和(自身を含む): 53625600

約数和(自身を除く): 32127860

約数列:

[1, 2, 4, 5, 10, 11, 19, 20, 22, 37, 38, 44, 55, 74, 76, 95, 110, 139, 148, 185, 190, 209, 220, 278, 370, 380, 407, 418, 556, 695, 703, 740, 814, 836, 1045, 1390, 1406, 1529, 1628, 2035, 2090, 2641, 2780, 2812, 3058, 3515, 4070, 4180, 5143, 5282, 6116, 7030, 7645, 7733, 8140, 10286, 10564, 13205, 14060, 15290, 15466, 20572, 25715, 26410, 29051, 30580, 30932, 38665, 51430, 52820, 56573, 58102, 77330, 97717, 102860, 113146, 116204, 145255, 154660, 195434, 226292, 282865, 290510, 390868, 488585, 565730, 581020, 977170, 1074887, 1131460, 1954340, 2149774, 4299548, 5374435, 10748870, 21497740]

約数ペア:

[(1, 21497740), (2, 10748870), (4, 5374435), (5, 4299548), (10, 2149774), (11, 1954340), (19, 1131460), (20, 1074887), (22, 977170), (37, 581020), (38, 565730), (44, 488585), (55, 390868), (74, 290510), (76, 282865), (95, 226292), (110, 195434), (139, 154660), (148, 145255), (185, 116204), (190, 113146), (209, 102860), (220, 97717), (278, 77330), (370, 58102), (380, 56573), (407, 52820), (418, 51430), (556, 38665), (695, 30932), (703, 30580), (740, 29051), (814, 26410), (836, 25715), (1045, 20572), (1390, 15466), (1406, 15290), (1529, 14060), (1628, 13205), (2035, 10564), (2090, 10286), (2641, 8140), (2780, 7733), (2812, 7645), (3058, 7030), (3515, 6116), (4070, 5282), (4180, 5143)]